The quality is the key concept in each and every analysis as well as in computing applications. Today we
gather large volumes of information and store them in multidimensional mode that is in data warehouses
then analyze the data to be used in exact decision making in various fields. The studies proved that most of
the volumes of data are not useful for analysis due to lack of quality caused by improper data handling
techniques. This paper try to find out a solution to achieve the quality of data from the foundation of data
repositories and try to avoid quality anomalies at meta data level. This paper also proposes the new model
of Meta data architecture.
A ROBUST APPROACH FOR DATA CLEANING USED BY DECISION TREEijcsa
Now a day’s every second trillion of bytes of data is being generated by enterprises especially in internet.To achieve the best decision for business profits, access to that data in a well-situated and interactive way is always a dream of business executives and managers. Data warehouse is the only viable solution that can bring the dream into veracity. The enhancement of future endeavours to make decisions depends on the availability of correct information that is based on quality of data underlying. The quality data can only be produced by cleaning data prior to loading into data warehouse since the data collected from different sources will be dirty. Once the data have been pre-processed and cleansed then it produces accurate results on applying the data mining query. Therefore the accuracy of data is vital for well-formed and reliable decision making. In this paper, we propose a framework which implements robust data quality to ensure consistent and correct loading of data into data warehouses which ensures accurate and reliable data analysis, data mining and knowledge discovery.
Data base and data entry presentation by mj n somyaMukesh Jaiswal
A database is a collection of organized information that can be accessed and managed efficiently. Clinical databases aim to accurately capture and store patient data to facilitate analysis and reporting. Relational databases are commonly used as they allow data to be organized into tables and linked together through common identifiers. Data entry involves transferring paper records into electronic format in the database. Double data entry checks for errors by having two people enter the same data, while single entry relies more on in-built validation checks. Databases must be designed carefully to collect only necessary variables and ensure high data quality.
IRJET- A Review of Data Cleaning and its Current ApproachesIRJET Journal
This document summarizes various approaches to data cleaning. It begins by stating that data cleaning is an important preprocessing step in data mining to detect and remove corrupted, inaccurate, or inconsistent data. It then reviews several common data cleaning techniques, including constraint-based data repairing, statistical methods, interactive approaches, Hadoop-based distributed cleaning, and clustering-based outlier detection. The document concludes that the appropriate cleaning approach depends on the type of data but the overall goal is to improve data quality and accuracy for downstream analysis and mining.
Measuring Improvement in Access to Complete Data in Healthcare Collaborative ...Nurul Emran
1) The document evaluates a Collaborative Integrated Database System (COLLIDS) in terms of improving access to complete healthcare data from multiple providers.
2) Statistical analysis found a significant improvement in data completeness after implementing COLLIDS, with over 50% completeness for most providers.
3) COLLIDS was shown to benefit all participating healthcare providers by improving access to more complete patient records compared to individual provider access alone.
Data Quality Integration (ETL) Open SourceStratebi
Data quality is the process of ensuring data values conform to business requirements. It is important for business intelligence projects which involve data integration from multiple sources. Pentaho Data Integration and DataCleaner are open source tools that can be used together for data integration and quality tasks like extraction, transformation, loading, cleansing and profiling. Performing data quality as part of the ETL process through tools like these helps standardize processes and improve scalability.
This document provides an introduction to data management. It discusses why data should be managed, including benefits like enabling verification, new research, and cost savings. It also covers topics like data entry and manipulation, quality control, and sharing data. Effective data management results in high quality, accessible data that can be cited, reused, and helps researchers gain recognition.
This document discusses data mining applications in the telecommunications industry. It begins with an overview of the data mining process and definitions. It then describes the types of data generated by telecommunications companies, including call detail data, network data, and customer data. The document outlines several common data mining applications for telecommunications companies, including fraud detection, marketing/customer profiling, and network fault isolation. Specific examples within marketing like customer churn and insolvency prediction are also mentioned.
Editing, cleaning and coding of data in Business research methodology VaishaghMp
Cleaning and editing of data involves reviewing collected data to remove errors and inconsistencies. This includes checking for missing answers, answers in the wrong place, or logically inconsistent responses. Coding converts qualitative data into quantitative data by assigning numerical values to response choices. It allows large amounts of information to be reduced to an easily handled form. Both cleaning and coding improve the quality and accuracy of collected data.
A ROBUST APPROACH FOR DATA CLEANING USED BY DECISION TREEijcsa
Now a day’s every second trillion of bytes of data is being generated by enterprises especially in internet.To achieve the best decision for business profits, access to that data in a well-situated and interactive way is always a dream of business executives and managers. Data warehouse is the only viable solution that can bring the dream into veracity. The enhancement of future endeavours to make decisions depends on the availability of correct information that is based on quality of data underlying. The quality data can only be produced by cleaning data prior to loading into data warehouse since the data collected from different sources will be dirty. Once the data have been pre-processed and cleansed then it produces accurate results on applying the data mining query. Therefore the accuracy of data is vital for well-formed and reliable decision making. In this paper, we propose a framework which implements robust data quality to ensure consistent and correct loading of data into data warehouses which ensures accurate and reliable data analysis, data mining and knowledge discovery.
Data base and data entry presentation by mj n somyaMukesh Jaiswal
A database is a collection of organized information that can be accessed and managed efficiently. Clinical databases aim to accurately capture and store patient data to facilitate analysis and reporting. Relational databases are commonly used as they allow data to be organized into tables and linked together through common identifiers. Data entry involves transferring paper records into electronic format in the database. Double data entry checks for errors by having two people enter the same data, while single entry relies more on in-built validation checks. Databases must be designed carefully to collect only necessary variables and ensure high data quality.
IRJET- A Review of Data Cleaning and its Current ApproachesIRJET Journal
This document summarizes various approaches to data cleaning. It begins by stating that data cleaning is an important preprocessing step in data mining to detect and remove corrupted, inaccurate, or inconsistent data. It then reviews several common data cleaning techniques, including constraint-based data repairing, statistical methods, interactive approaches, Hadoop-based distributed cleaning, and clustering-based outlier detection. The document concludes that the appropriate cleaning approach depends on the type of data but the overall goal is to improve data quality and accuracy for downstream analysis and mining.
Measuring Improvement in Access to Complete Data in Healthcare Collaborative ...Nurul Emran
1) The document evaluates a Collaborative Integrated Database System (COLLIDS) in terms of improving access to complete healthcare data from multiple providers.
2) Statistical analysis found a significant improvement in data completeness after implementing COLLIDS, with over 50% completeness for most providers.
3) COLLIDS was shown to benefit all participating healthcare providers by improving access to more complete patient records compared to individual provider access alone.
Data Quality Integration (ETL) Open SourceStratebi
Data quality is the process of ensuring data values conform to business requirements. It is important for business intelligence projects which involve data integration from multiple sources. Pentaho Data Integration and DataCleaner are open source tools that can be used together for data integration and quality tasks like extraction, transformation, loading, cleansing and profiling. Performing data quality as part of the ETL process through tools like these helps standardize processes and improve scalability.
This document provides an introduction to data management. It discusses why data should be managed, including benefits like enabling verification, new research, and cost savings. It also covers topics like data entry and manipulation, quality control, and sharing data. Effective data management results in high quality, accessible data that can be cited, reused, and helps researchers gain recognition.
This document discusses data mining applications in the telecommunications industry. It begins with an overview of the data mining process and definitions. It then describes the types of data generated by telecommunications companies, including call detail data, network data, and customer data. The document outlines several common data mining applications for telecommunications companies, including fraud detection, marketing/customer profiling, and network fault isolation. Specific examples within marketing like customer churn and insolvency prediction are also mentioned.
Editing, cleaning and coding of data in Business research methodology VaishaghMp
Cleaning and editing of data involves reviewing collected data to remove errors and inconsistencies. This includes checking for missing answers, answers in the wrong place, or logically inconsistent responses. Coding converts qualitative data into quantitative data by assigning numerical values to response choices. It allows large amounts of information to be reduced to an easily handled form. Both cleaning and coding improve the quality and accuracy of collected data.
Peter Embi's 2011 AMIA CRI Year-in-ReviewPeter Embi
This document discusses Peter Embi's presentation on clinical research informatics. The presentation included summaries of 22 research papers on topics like data warehousing and knowledge discovery, researcher support and resources, and recruitment informatics. It also discussed ongoing efforts to integrate informatics approaches and resources to support clinical and translational research.
The document proposes an automated approach for data validation testing during data migration projects to improve data quality assurance. It discusses how traditional manual and sampling-based testing methods are time consuming and do not thoroughly validate all migrated data. The proposed system utilizes reusable query snippets and schedules automated testing of source and target databases to generate summary and detailed reports of any data mismatches or defects. This allows 100% of migrated data to be validated while reducing time, costs and errors compared to traditional approaches.
This document discusses a theoretical model for understanding how users assess the contextual quality of information when making decisions. The model is based on dual-process theories of cognition, which propose that users process information both systematically, by carefully analyzing objective quality metadata, and heuristically, by relying on mental shortcuts. The model suggests that the degree to which users employ each type of processing depends on characteristics of the user (e.g. their expertise) and the decision task (e.g. its ambiguity). An exploratory study provides initial evidence that the model can help explain how these factors influence how users evaluate both the objective and contextual aspects of information quality.
This document provides an overview of the statistical software IBM SPSS and its uses. It discusses SPSS's abilities in descriptive statistics, bivariate statistics, prediction, and identifying groups. The document also explores the basic use of SPSS, including how to enter data and define variable meanings. Finally, it examines the dataset "country.sav" that could be used for a class project, focusing on variables like GDP, life expectancy, and healthcare that reflect living standards across countries.
Application of hidden markov model in question answering systemsijcsa
By the increase of the volume of the saved information on web, Question Answering (QA) systems have been very important for Information Retrieval (IR). QA systems are a specialized form of information retrieval. Given a collection of documents, a Question Answering system attempts to retrieve correct answers to questions posed in natural language. Web QA system is a sample of QA systems that in this system answers retrieval from web environment doing. In contrast to the databases, the saved information on web does not follow a distinct structure and are not generally defined. Web QA systems is the task of automatically answering a question posed in Natural Language Processing (NLP). NLP techniques are used in applications that make queries to databases, extract information from text, retrieve relevant documents from a collection, translate from one language to another, generate text responses, or recognize spoken words converting them into text. To find the needed information on a mass of the non-structured information we have to use techniques in which the accuracy and retrieval factors are implemented well. In this paper in order to well IR in web environment, The QA system in designed and also implemented based on the Hidden Markov Model (HMM)
Building a Data Quality Program from Scratchdmurph4
The document outlines steps for building a data quality program from scratch, including defining data quality, identifying factors that impact quality, best practices, common causes of poor quality data, benefits of high quality data, and who is responsible. It then provides recommendations for getting started with a proof of concept, expanding to full projects, profiling data, analyzing and fixing issues, monitoring, and celebrating wins.
This document discusses data quality and provides facts about the high costs of poor data quality to businesses and the US economy. It defines data quality as ensuring data is "fit for purpose" by measuring it against its intended uses and dimensions of quality. The document outlines best practices for measuring data quality including profiling data to understand metadata and trends, using statistical process control, master data management to create standardized "gold records", and implementing a data governance program to centrally manage data quality.
Clinicians rely on health information technologies (HITs) for clinical data collection, but current HITs are inflexible and inconsistent with clinicians' needs. The researchers propose a flexible electronic health record (fEHR) system to allow clinicians to easily modify the system based on their changing data collection needs. The fEHR uses a form-based interface for clinicians to design forms, generates a corresponding form tree structure, and designs a high-quality database from the tree. A user study with 5 nurses found they could effectively replicate needs in the system and their efficiency and understanding improved over two rounds of tasks of increasing complexity. The researchers conclude the fEHR has potential to reduce HIT problems and that the database design
data entry operations for class 12th chapter vise presentationgopeshkhandelwal7
chapters vise summary of all the chapters of data entry operations for class 12th nios with animation , sounds , transitions ,and other special effects . 54 slides with each chapter having 4-6 slides .
Thank You
with regards
Gopesh Khandelwal
STUDENTS’ PERFORMANCE PREDICTION SYSTEM USING MULTI AGENT DATA MINING TECHNIQUEIJDKP
The document discusses a proposed students' performance prediction system using multi-agent data mining techniques. It aims to predict student performance with high accuracy and help low-performing students. The system uses ensemble classifiers like Adaboost.M1 and LogitBoost and compares their prediction accuracy to the single classifier C4.5 decision tree. Experimental results showed SAMME boosting improved prediction accuracy over C4.5 and LogitBoost.
An empirical performance evaluation of relational keyword search systemsBrowse Jobs
The document presents an empirical performance evaluation of relational keyword search systems. It evaluates 7 relational keyword search techniques and finds that many existing techniques do not provide acceptable performance for realistic retrieval tasks. In particular, memory consumption prevents many search techniques from scaling to datasets with more than tens of thousands of vertices. The evaluation also explores how factors varied in previous studies have relatively little impact on performance. The work confirms that existing systems have unacceptable performance and underscores the need for standardization in evaluating these retrieval systems.
A gigantic archive of terabytes of information is created every day from current data frameworks and computerized advances, for example, Internet of Things and distributed computing. Examination of these gigantic information requires a ton of endeavors at various levels to extricate information for dynamic. Hence, huge information examination is an ebb and flow region of innovative work. The essential goal of this paper is to investigate the likely effect of huge information challenges, and different instruments related with it. Accordingly, this article gives a stage to investigate enormous information at various stages. Moreover, it opens another skyline for analysts to build up the arrangement, in light of the difficulties and open exploration issues.
The document summarizes the team's approach to the KDD Cup 2014 competition to predict exciting projects on the DonorsChoose.org platform. It describes the provided data, data preprocessing steps including handling missing data and feature encoding. It then discusses the main methods used: random forests, gradient boosting regression trees, and logistic regression. The team also tested neural networks but faced challenges training the models. Their final submission was an ensemble of the three main methods, weighted based on their performance.
IRJET-Efficient Data Linkage Technique using one Class Clustering Tree for Da...IRJET Journal
This document proposes a new one-to-many data linkage technique using a One-Class Clustering Tree (OCCT) to link records from different datasets. The technique constructs a decision tree where internal nodes represent attributes from the first dataset and leaves represent attributes from the second dataset that match. It uses maximum likelihood estimation for splitting criteria and pre-pruning to reduce complexity. The method is applied to the database misuse domain to identify common and malicious users by analyzing access request contexts and accessible data. Evaluation shows the technique achieves better precision and recall than existing methods.
Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can...Anastasija Nikiforova
This presentations is a supplementary material for presenting the "Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can Save Your Business" (authored by Anastasija Nikiforova and Natalija Kozmina) research paper during the The International Conference on Intelligent Data Science Technologies and Applications (IDSTA2021), November 15-16, 2021. Tartu, Estonia (web-based)
Read paper here -> Nikiforova, A., & Kozmina, N. (2021, November). Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can Save Your Business. In 2021 Second International Conference on Intelligent Data Science Technologies and Applications (IDSTA) (pp. 66-73). IEEE -> https://ieeexplore.ieee.org/abstract/document/9660802?casa_token=LFJa20LrXAwAAAAA:wVwhTcCPWqxdloAvDQ3-l98KkkLx70xzG3zNvIIkJbC6wvJ4VxwX_VGc3mmW_7c1T-QJlOtTiao
A simplified approach for quality management in data warehouseIJDKP
Data warehousing is continuously gaining importance as organizations are realizing the benefits of
decision oriented data bases. However, the stumbling block to this rapid development is data quality issues
at various stages of data warehousing. Quality can be defined as a measure of excellence or a state free
from defects. Users appreciate quality products and available literature suggests that many organization`s
have significant data quality problems that have substantial social and economic impacts. A metadata
based quality system is introduced to manage quality of data in data warehouse. The approach is used to
analyze the quality of data warehouse system by checking the expected value of quality parameters with
that of actual values. The proposed approach is supported with a metadata framework that can store
additional information to analyze the quality parameters, whenever required.
Evaluating the effectiveness of data quality framework in software engineeringIJECEIAES
The quality of data is important in research working with data sets because poor data quality may lead to invalid results. Data sets contain measurements that are associated with metrics and entities; however, in some data sets, it is not always clear which entities have been measured and exactly which metrics have been used. This means that measurements could be misinterpreted. In this study, we develop a framework for data quality assessment that determines whether a data set has sufficient information to support the correct interpretation of data for analysis in empirical research. The framework incorporates a dataset metamodel and a quality assessment process to evaluate the data set quality. To evaluate the effectiveness of our framework, we conducted a user study. We used observations, a questionnaire and think aloud approach to provide insights into the framework through participant thought processes while applying the framework. The results of our study provide evidence that most participants successfully applied the definitions of dataset category elements and the formal definitions of data quality issues to the datasets. Further work is needed to reproduce our results with more participants, and to determine whether the data quality framework is generalizable to other types of data sets.
Peter Embi's 2011 AMIA CRI Year-in-ReviewPeter Embi
This document discusses Peter Embi's presentation on clinical research informatics. The presentation included summaries of 22 research papers on topics like data warehousing and knowledge discovery, researcher support and resources, and recruitment informatics. It also discussed ongoing efforts to integrate informatics approaches and resources to support clinical and translational research.
The document proposes an automated approach for data validation testing during data migration projects to improve data quality assurance. It discusses how traditional manual and sampling-based testing methods are time consuming and do not thoroughly validate all migrated data. The proposed system utilizes reusable query snippets and schedules automated testing of source and target databases to generate summary and detailed reports of any data mismatches or defects. This allows 100% of migrated data to be validated while reducing time, costs and errors compared to traditional approaches.
This document discusses a theoretical model for understanding how users assess the contextual quality of information when making decisions. The model is based on dual-process theories of cognition, which propose that users process information both systematically, by carefully analyzing objective quality metadata, and heuristically, by relying on mental shortcuts. The model suggests that the degree to which users employ each type of processing depends on characteristics of the user (e.g. their expertise) and the decision task (e.g. its ambiguity). An exploratory study provides initial evidence that the model can help explain how these factors influence how users evaluate both the objective and contextual aspects of information quality.
This document provides an overview of the statistical software IBM SPSS and its uses. It discusses SPSS's abilities in descriptive statistics, bivariate statistics, prediction, and identifying groups. The document also explores the basic use of SPSS, including how to enter data and define variable meanings. Finally, it examines the dataset "country.sav" that could be used for a class project, focusing on variables like GDP, life expectancy, and healthcare that reflect living standards across countries.
Application of hidden markov model in question answering systemsijcsa
By the increase of the volume of the saved information on web, Question Answering (QA) systems have been very important for Information Retrieval (IR). QA systems are a specialized form of information retrieval. Given a collection of documents, a Question Answering system attempts to retrieve correct answers to questions posed in natural language. Web QA system is a sample of QA systems that in this system answers retrieval from web environment doing. In contrast to the databases, the saved information on web does not follow a distinct structure and are not generally defined. Web QA systems is the task of automatically answering a question posed in Natural Language Processing (NLP). NLP techniques are used in applications that make queries to databases, extract information from text, retrieve relevant documents from a collection, translate from one language to another, generate text responses, or recognize spoken words converting them into text. To find the needed information on a mass of the non-structured information we have to use techniques in which the accuracy and retrieval factors are implemented well. In this paper in order to well IR in web environment, The QA system in designed and also implemented based on the Hidden Markov Model (HMM)
Building a Data Quality Program from Scratchdmurph4
The document outlines steps for building a data quality program from scratch, including defining data quality, identifying factors that impact quality, best practices, common causes of poor quality data, benefits of high quality data, and who is responsible. It then provides recommendations for getting started with a proof of concept, expanding to full projects, profiling data, analyzing and fixing issues, monitoring, and celebrating wins.
This document discusses data quality and provides facts about the high costs of poor data quality to businesses and the US economy. It defines data quality as ensuring data is "fit for purpose" by measuring it against its intended uses and dimensions of quality. The document outlines best practices for measuring data quality including profiling data to understand metadata and trends, using statistical process control, master data management to create standardized "gold records", and implementing a data governance program to centrally manage data quality.
Clinicians rely on health information technologies (HITs) for clinical data collection, but current HITs are inflexible and inconsistent with clinicians' needs. The researchers propose a flexible electronic health record (fEHR) system to allow clinicians to easily modify the system based on their changing data collection needs. The fEHR uses a form-based interface for clinicians to design forms, generates a corresponding form tree structure, and designs a high-quality database from the tree. A user study with 5 nurses found they could effectively replicate needs in the system and their efficiency and understanding improved over two rounds of tasks of increasing complexity. The researchers conclude the fEHR has potential to reduce HIT problems and that the database design
data entry operations for class 12th chapter vise presentationgopeshkhandelwal7
chapters vise summary of all the chapters of data entry operations for class 12th nios with animation , sounds , transitions ,and other special effects . 54 slides with each chapter having 4-6 slides .
Thank You
with regards
Gopesh Khandelwal
STUDENTS’ PERFORMANCE PREDICTION SYSTEM USING MULTI AGENT DATA MINING TECHNIQUEIJDKP
The document discusses a proposed students' performance prediction system using multi-agent data mining techniques. It aims to predict student performance with high accuracy and help low-performing students. The system uses ensemble classifiers like Adaboost.M1 and LogitBoost and compares their prediction accuracy to the single classifier C4.5 decision tree. Experimental results showed SAMME boosting improved prediction accuracy over C4.5 and LogitBoost.
An empirical performance evaluation of relational keyword search systemsBrowse Jobs
The document presents an empirical performance evaluation of relational keyword search systems. It evaluates 7 relational keyword search techniques and finds that many existing techniques do not provide acceptable performance for realistic retrieval tasks. In particular, memory consumption prevents many search techniques from scaling to datasets with more than tens of thousands of vertices. The evaluation also explores how factors varied in previous studies have relatively little impact on performance. The work confirms that existing systems have unacceptable performance and underscores the need for standardization in evaluating these retrieval systems.
A gigantic archive of terabytes of information is created every day from current data frameworks and computerized advances, for example, Internet of Things and distributed computing. Examination of these gigantic information requires a ton of endeavors at various levels to extricate information for dynamic. Hence, huge information examination is an ebb and flow region of innovative work. The essential goal of this paper is to investigate the likely effect of huge information challenges, and different instruments related with it. Accordingly, this article gives a stage to investigate enormous information at various stages. Moreover, it opens another skyline for analysts to build up the arrangement, in light of the difficulties and open exploration issues.
The document summarizes the team's approach to the KDD Cup 2014 competition to predict exciting projects on the DonorsChoose.org platform. It describes the provided data, data preprocessing steps including handling missing data and feature encoding. It then discusses the main methods used: random forests, gradient boosting regression trees, and logistic regression. The team also tested neural networks but faced challenges training the models. Their final submission was an ensemble of the three main methods, weighted based on their performance.
IRJET-Efficient Data Linkage Technique using one Class Clustering Tree for Da...IRJET Journal
This document proposes a new one-to-many data linkage technique using a One-Class Clustering Tree (OCCT) to link records from different datasets. The technique constructs a decision tree where internal nodes represent attributes from the first dataset and leaves represent attributes from the second dataset that match. It uses maximum likelihood estimation for splitting criteria and pre-pruning to reduce complexity. The method is applied to the database misuse domain to identify common and malicious users by analyzing access request contexts and accessible data. Evaluation shows the technique achieves better precision and recall than existing methods.
Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can...Anastasija Nikiforova
This presentations is a supplementary material for presenting the "Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can Save Your Business" (authored by Anastasija Nikiforova and Natalija Kozmina) research paper during the The International Conference on Intelligent Data Science Technologies and Applications (IDSTA2021), November 15-16, 2021. Tartu, Estonia (web-based)
Read paper here -> Nikiforova, A., & Kozmina, N. (2021, November). Stakeholder-centred Identification of Data Quality Issues: Knowledge that Can Save Your Business. In 2021 Second International Conference on Intelligent Data Science Technologies and Applications (IDSTA) (pp. 66-73). IEEE -> https://ieeexplore.ieee.org/abstract/document/9660802?casa_token=LFJa20LrXAwAAAAA:wVwhTcCPWqxdloAvDQ3-l98KkkLx70xzG3zNvIIkJbC6wvJ4VxwX_VGc3mmW_7c1T-QJlOtTiao
A simplified approach for quality management in data warehouseIJDKP
Data warehousing is continuously gaining importance as organizations are realizing the benefits of
decision oriented data bases. However, the stumbling block to this rapid development is data quality issues
at various stages of data warehousing. Quality can be defined as a measure of excellence or a state free
from defects. Users appreciate quality products and available literature suggests that many organization`s
have significant data quality problems that have substantial social and economic impacts. A metadata
based quality system is introduced to manage quality of data in data warehouse. The approach is used to
analyze the quality of data warehouse system by checking the expected value of quality parameters with
that of actual values. The proposed approach is supported with a metadata framework that can store
additional information to analyze the quality parameters, whenever required.
Evaluating the effectiveness of data quality framework in software engineeringIJECEIAES
The quality of data is important in research working with data sets because poor data quality may lead to invalid results. Data sets contain measurements that are associated with metrics and entities; however, in some data sets, it is not always clear which entities have been measured and exactly which metrics have been used. This means that measurements could be misinterpreted. In this study, we develop a framework for data quality assessment that determines whether a data set has sufficient information to support the correct interpretation of data for analysis in empirical research. The framework incorporates a dataset metamodel and a quality assessment process to evaluate the data set quality. To evaluate the effectiveness of our framework, we conducted a user study. We used observations, a questionnaire and think aloud approach to provide insights into the framework through participant thought processes while applying the framework. The results of our study provide evidence that most participants successfully applied the definitions of dataset category elements and the formal definitions of data quality issues to the datasets. Further work is needed to reproduce our results with more participants, and to determine whether the data quality framework is generalizable to other types of data sets.
Knowledge discovery is the process of adding knowledge from a large amount of data. The quality of knowledge generated from the process of knowledge discovery greatly affects the results of the decisions obtained. Existing data must be qualified and tested to ensure knowledge discovery processes can produce knowledge or information that is useful and feasible. It deals with strategic decision making for an organization. Combining multiple operational databases and external data create data warehouse. This treatment is very vulnerable to incomplete, inconsistent, and noisy data. Data mining provides a mechanism to clear this deficiency before finally stored in the data warehouse. This research tries to give technique to improve the quality of information in the data warehouse.
Optimize Your Healthcare Data Quality Investment: Three Ways to Accelerate Ti...Health Catalyst
Healthcare organizations increasingly rely on data to inform strategic decisions. This growing dependence makes ensuring data across the organization is fit for purpose more critical than ever. Decision-making challenges associated with pandemic-driven urgency, variety of data, and lack of resources have further highlighted the critical importance of healthcare data quality and prompted more focus and investment. However, many data quality initiatives are too narrow in focus and reactive in nature or take longer than expected to demonstrate value. This leaves organizations unprepared for future events, like COVID-19, that require a rapid enterprise-wide analytic response.
What are some actionable ways you can help your organization guard against the data quality challenges uncovered this past year and better prepare to respond in the future? Join Taylor Larsen, Director of Data Quality for Health Catalyst, to learn more.
What You’ll Learn
- How data profiling and data quality assessments, in combination with your data catalog, can increase data quality transparency, expedite root cause analysis, and close data quality monitoring gaps.
- How to leverage AI to reduce data quality monitoring configuration and maintenance time and improve accuracy.
- How defining data quality based on its measurable utility (i.e., data represents information that supports better decisions) can provide a scalable way to ensure data are fit for purpose and avoid cost outstripping return.
As per EU MDR, Post Marketing Clinical Follow-up (PMCF) is a continuous process where device manufacturers need to proactively collect and evaluate clinical data of the device when it is used as per the intended purpose. EU MDR gives more emphasize on PMCF data to confirm the safety and performance of the device throughout its expected lifetime, ensure continued acceptability of identified risks and detect emerging risks based on factual evidence.
This document discusses data quality and why it is important. It begins by defining what high quality data is, noting that data should be "fit for use" and conform to standards. It then discusses five key aspects of data quality - relevance, accuracy, timeliness, comparability, and completeness. The document explains that there are three ways to obtain high quality data: prevention, detection, and repair, but prevention is most effective. It provides a practical example of making a customer database "fit for use" by developing clear requirements and procedures.
Data Quality: A Raising Data Warehousing ConcernAmin Chowdhury
Characteristics of Data Warehouse
Benefits of a data warehouse
Designing of Data Warehouse
Extract, Transform, Load (ETL)
Data Quality
Classification Of Data Quality Issues
Causes Of Data Quality
Impact of Data Quality Issues
Cost of Poor Data Quality
Confidence and Satisfaction-based impacts
Impact on Productivity
Risk and Compliance impacts
Why Data Quality Influences?
Causes of Data Quality Problems
How to deal: Missing Data
Data Corruption
Data: Out of Range error
Techniques of Data Quality Control
Data warehousing security
8 Guiding Principles to Kickstart Your Healthcare Big Data ProjectCitiusTech
This white paper illustrates our experiences and learnings across multiple Big Data implementation projects. It contains a broad set of guidelines and best practices around Big Data management.
Data quality measures the accuracy, completeness, and consistency of data, while data observability monitors the overall health of data systems. Data observability builds on data quality by identifying, troubleshooting, and preventing data issues. Together, data quality and observability work to ensure data is useful and reliable.
This document discusses data quality testing. It begins by defining data quality and listing its key dimensions such as accuracy, consistency, completeness and timeliness. It then notes common business problems caused by poor data quality and the benefits of improving data quality. Key aspects of data quality testing covered include planning, design, execution, monitoring and challenges. Best practices emphasized include understanding the business, planning for data quality early, being proactive about data growth and thoroughly understanding the data.
Business Case for leveraging Machine Learning (ML) to Validate Data Lake.pdfarifulislam946965
Without effective and comprehensive validation, a data lake becomes a data
swamp and does not offer a clear link to value creation to business.
Organizations are rapidly adopting Cloud Data Lake as the data lake of choice.
Data Cleaning Service for Data Warehouse: An Experimental Comparative Study o...TELKOMNIKA JOURNAL
Data warehouse is a collective entity of data from various data sources. Data are prone to several
complications and irregularities in data warehouse. Data cleaning service is non trivial activity to ensure
data quality. Data cleaning service involves identification of errors, removing them and improve the quality of
data. One of the common methods is duplicate elimination. This research focuses on the service of duplicate
elimination on local data. It initially surveys data quality focusing on quality problems, cleaning methodology,
involved stages and services within data warehouse environment. It also provides a comparison through
some experiments on local data with different cases, such as different spelling on different pronunciation,
misspellings, name abbreviation, honorific prefixes, common nicknames, splitted name and exact match. All
services are evaluated based on the proposed quality of service metrics such as performance, capability to
process the number of records, platform support, data heterogeneity, and price; so that in the future these
services are reliable to handle big data in data warehouse.
Fortune 1000 organizations spend approximately $5 billion each year to improve
the trustworthiness of data. Yet only 42 percent of the executives trust their data.
This document proposes enhancing data staging as a mechanism for fast data access. It discusses challenges with current data warehousing systems, including performance issues as data volumes increase. It then introduces the concept of data staging and proposes a new approach called Deterministic Prioritization to improve data staging. This approach would prioritize and filter data in the staging area based on confidence levels and distinctiveness, to reduce processing loads. It would create clustered indexes on distinct data columns to alter query execution plans and improve performance. The goal is to develop a new cross-platform data staging framework with forecasting and prioritization mechanisms to optimize data transfer and system resource usage.
Enhancing Data Staging as a Mechanism for Fast Data AccessEditor IJCATR
Most organizations rely on data in their daily transactions and operations. This data is retrieved from different source
systems in a distributed network hence it comes in varying data types and formats. The source data is prepared and cleaned by
subjecting it to algorithms and functions before transferring it to the target systems which takes more time. Moreover, there is pressure
from data users within the data warehouse for data to be availed quickly for them to make appropriate decisions and forecasts. This has
not been the case due to immense data explosion in millions of transactions resulting from business processes of the organizations. The
current legacy systems cannot handle large data levels due to processing capabilities and customizations. This approach has failed
because there lacks clear procedures to decide which data to collect or exempt. It is with this concern that performance degradation
should be addressed because organizations invest a lot of resources to establish a functioning data warehouse. Data staging is a
technological innovation within data warehouses where data manipulations are carried out before transfer to target systems. It carries
out data integration by harmonizing the staging functions, cleansing, verification, and archiving source data. Deterministic
Prioritization Approach will be employed to enhance data staging, and to clearly prove this change Experiment design is needed to test
scenarios in the study. Previous studies in this field have mainly focused in the data warehouses processes as a whole but less to the
specifics of data staging area.
Enhancing Data Staging as a Mechanism for Fast Data AccessEditor IJCATR
Most organizations rely on data in their daily transactions and operations. This data is retrieved from different source systems in a distributed network hence it comes in varying data types and formats. The source data is prepared and cleaned by subjecting it to algorithms and functions before transferring it to the target systems which takes more time. Moreover, there is pressure from data users within the data warehouse for data to be availed quickly for them to make appropriate decisions and forecasts. This has not been the case due to immense data explosion in millions of transactions resulting from business processes of the organizations. The current legacy systems cannot handle large data levels due to processing capabilities and customizations. This approach has failed because there lacks clear procedures to decide which data to collect or exempt. It is with this concern that performance degradation should be addressed because organizations invest a lot of resources to establish a functioning data warehouse. Data staging is a technological innovation within data warehouses where data manipulations are carried out before transfer to target systems. It carries out data integration by harmonizing the staging functions, cleansing, verification, and archiving source data. Deterministic Prioritization Approach will be employed to enhance data staging, and to clearly prove this change Experiment design is needed to test scenarios in the study. Previous studies in this field have mainly focused in the data warehouses processes as a whole but less to the specifics of data staging area.
Enhancing Data Staging as a Mechanism for Fast Data AccessEditor IJCATR
Most organizations rely on data in their daily transactions and operations. This data is retrieved from different source
systems in a distributed network hence it comes in varying data types and formats. The source data is prepared and cleaned by
subjecting it to algorithms and functions before transferring it to the target systems which takes more time. Moreover, there is pressure
from data users within the data warehouse for data to be availed quickly for them to make appropriate decisions and forecasts. This has
not been the case due to immense data explosion in millions of transactions resulting from business processes of the organizations. The
current legacy systems cannot handle large data levels due to processing capabilities and customizations. This approach has failed
because there lacks clear procedures to decide which data to collect or exempt. It is with this concern that performance degradation
should be addressed because organizations invest a lot of resources to establish a functioning data warehouse. Data staging is a
technological innovation within data warehouses where data manipulations are carried out before transfer to target systems. It carries
out data integration by harmonizing the staging functions, cleansing, verification, and archiving source data. Deterministic
Prioritization Approach will be employed to enhance data staging, and to clearly prove this change Experiment design is needed to test
scenarios in the study. Previous studies in this field have mainly focused in the data warehouses processes as a whole but less to the
specifics of data staging area.
Enhancing Data Staging as a Mechanism for Fast Data AccessEditor IJCATR
This document proposes enhancing data staging as a mechanism for fast data access. It discusses challenges with current data warehousing systems, including performance issues as data volumes increase. It then introduces the concept of data staging and proposes a new approach called Deterministic Prioritization to improve data staging. This approach would prioritize and filter data in the staging area based on confidence levels and distinctiveness, to reduce processing loads. It would create clustered indexes on distinct data columns to alter query execution plans and improve performance. The goal is to develop a new cross-platform data staging framework with forecasting and prioritization mechanisms to optimize resource usage and data transfer speeds.
Top 30 Data Analyst Interview Questions.pdfShaikSikindar1
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META DATA QUALITY CONTROL ARCHITECTURE IN DATA WAREHOUSING
1. International Journal of Computer Science, Engineering and Information Technology (IJCSEIT), Vol.2, No.4, August 2012
DOI : 10.5121/ijcseit.2012.2402 15
META DATA QUALITY CONTROL
ARCHITECTURE IN DATA WAREHOUSING
Ramesh Babu Palepu1
, Dr K V Sambasiva Rao2
Dept of IT, Amrita Sai Institute of Science & Technology1
MVR College of Engineering2
asistithod@gmail.com
Abstract:
The quality is the key concept in each and every analysis as well as in computing applications. Today we
gather large volumes of information and store them in multidimensional mode that is in data warehouses
then analyze the data to be used in exact decision making in various fields. The studies proved that most of
the volumes of data are not useful for analysis due to lack of quality caused by improper data handling
techniques. This paper try to find out a solution to achieve the quality of data from the foundation of data
repositories and try to avoid quality anomalies at meta data level. This paper also proposes the new model
of Meta data architecture.
Keywords:
Data warehouse, Meta data, ETL, Total Quality Management
INTRODUCTION:
Implementation of Data Warehouse is right solution for complex business intelligent applications.
The Data Warehouses fail to meet the expectations because of lack of data quality. Once the data
warehouse is built, the issue of data quality does not go away. The data quality is a serious issue
in implementation and management of data warehouses. Before using the data within data
warehouses effectively, the data is to be analyzed and cleaned. In order to reap the benefits of
Business Intelligence, it is necessary to apply ongoing data cleaning processes and procedures
and track data quality levels over time.
The key area where the data warehouse fails is, moving data from various sources into easily
accessible single repository, that is, integration of the data. The data quality begins with
understanding the entire data within the data warehouse. The development of data warehouse for
business application for coordinated development of information systems is preferred to which
process different applications for the same purpose.
When the data warehouse is defined, the main task is to define granularity of data in the data
warehouse and different level of abstraction which will support the best decision making process.
A recent study by Standish Group states that 83% of data warehouse projects overrun their
budgets primarily as the result of misunderstanding about the source data and data definitions. A
similar survey conducted by Gartner Group point to data quality as a leading reason for overrun
and failed projects.
2. International Journal of Computer Science, Engineering and Information Technology (IJCSEIT), Vol.2, No.4, August 2012
16
To avoid such a pitfall, a thorough assessment of the quality of data is to be performed when data
warehouse is build and the data warehouse is populated with data gradually.
1. Quality Assessment Criteria:
The following is the assessment criteria defined according to English’s Total Quality data
Management (TQdM) Methodology and Forino’s recommendations.
Data quality assurance is a complex problem that requires a systematic approach. English
proposes a comprehensive Total Quality data Management Methodology which consists of six
processes of measuring and improving information quality and also about cultural and
environmental changes to sustain information quality improvement. The following are the six
processes,
1. Assess data definition and information architecture quality.
2. Assess information quality.
3. Measure non quality information costs.
4. Reengineer and cleanse data.
5. Assess Information process quality.
6. Establish information quality environment.
The above steps are further divided into sub processes to achieve the desired data quality.
To determine the quality of data a field-by-field assessment is required. Simply possessing data is
not enough, but the context for which the data is to exist must also be known, that is, Meta data.
Now, the assessment of the quality can be extended depending on availability of Meta data. Now
the quality criteria is defined as,
1. Data type integrity.
2. Business rule integrity.
3. Name and address integrity.
On the other hand, English defines the following inherent information quality characteristics and
measures;
1. Definition conformance
2. Completeness of values
3. Validity or business rule conformance
4. Accuracy to surrogate source
5. Accuracy to reality
6. Precision
7. Non duplication of occurrence
8. Equivalence of redundant or distributed data
9. Concurrency of redundant or distributed data
10. Accessibility
2. Classification of Data Quality Issues:
In order to analyze and to determine the scope of the underlying root causes of data quality issues
and to plan the design, it is valuable to understand these common data quality issues. This
classification is very helpful to the data warehouse and data quality community.
3. International Journal of Computer Science, Engineering and Information Technology (IJCSEIT), Vol.2, No.4, August 2012
17
2.1 Data Quality Issues at Data Sources:
Different data sources have different kind of problems associated with it such as data from legacy
data sources do not even have metadata that describe them. The sources of dirty data include data
entry error by a human or computer system, data update error by a human or computer system.
Part of the data comes from text files, part from MS Excel files and some of the data is direct
Open Data Base Connectivity (ODBC) connection to the source database. Some files are result of
manual consolidation of multiple files as a result of which data quality might be compromised at
any step. The following are the some of the causes of data quality problems at data sources.
1. Inadequate selection of candidate data sources.
2. Inadequate knowledge of inter dependencies among data sources.
3. Lack of validation routines at sources.
4. Unexpected changes in source systems.
5. Multiple data sources generate semantic heterogeneity which leads to quality issues.
6. Contradictory information presents in data sources.
7. Having inconsistent/Incorrect data formatting.
8. Multiple sources for the same data.
9. Inconsistent use of special characters of data.
2.2 Causes of Data Quality Issues at Data Profiling Stage:
When possible candidate data sources are identified and finalized data profiling comes in play
immediately. Data profiling is the examination and assessment of our source systems’ data
quality, integrity and consistency sometimes also called as source systems analysis. Data
profiling is a fundamental, yet often ignored or given less attention as result of which data quality
of the data warehouse is compromised. The following are the causes of data quality issues at data
profiling stage. The following are the causes for data quality at data profiling stage.
1. Insufficient data profiling of data sources.
2. Inappropriate selection of automated tools.
3. Insufficient structural analysis of data sources at profiling stage.
4. Unreliable and in complete Meta data causes data quality problems.
2.3 Data quality issues at data staging ETL (Extraction, Transformation and
Loading):
The extraction, transformation and loading phase is very crucial where maximum responsibilities
of data quality efforts reside in data warehousing. The data cleaning process is executed in data
staging in order to improve the accuracy of data warehouse. The following are data quality issues
at ETL.
1. The data warehouse architecture affects the data quality.
2. The relational and non relational effects in data warehouse affect the data quality.
3. Some times the business rules applied on data sources may cause for quality problems.
4. Lack of periodical refreshment of integrated data cause for data quality problems.
2.3 Data quality problems at schema design stage:
It is well known that the quality of data is depending on three things.
1. The quality of data itself.
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2. The quality of application program.
3. The quality of data base schema.
A special attention during the schema design by considering some issues such as slowly and
rapidly changing dimensions, multi valued dimensions etc in data warehouse. A flaw schema has
negative effect on data quality. The following are data quality issues at schema modeling phase.
1. In complete or wrong requirement analysis for schema design.
2. The selection of dimensional modeling such as star, snowflake, and fact constellation
may affect the data quality.
3. Multi valued dimensions, late identification of slowly changing dimensions and late
arrival dimensions may cause data quality problems.
4. In complete and wrong identification of facts may cause the data quality problems.
3. Data Quality problems in Data Warehouses:
The one definition of data quality is that it’s about bad data - data that is missing or incorrect or
invalid in some context. A broader definition is that data quality is achieved when organization
uses data that is comprehensive, understandable, consistent, relevant and timely. Understanding
the key data quality dimensions is the first step to data quality improvement. The dimensions of
data quality typically include accuracy, reliability, importance, consistency, precision, timeliness,
fineness, understandability, conciseness and usefulness. Here the quality criteria is undertaken by
taking six key dimensions as depicted below.
Figure 1: Data Quality Criteria
4. Data Warehouse Structure to achieve the Quality of Data:
A data Warehouse is a collection of technologies aimed at enabling the knowledge worker to
make better and faster decisions. It is expected to present the right information in the right place
at the right time with in the right cost in order to support the right decision. The practice proved
that the traditional online transaction processing (OLTP) systems are not appropriate for decision
support and the high speed networks cannot by themselves solve the information accessibility
problem. Data Warehouse has become an important strategy to integrate heterogeneous
information sources in organization, and to enable online Analytical Processing. The quality of
the data within the data warehouse is also depending on the semantic models of data warehouse
architecture.
Data Quality
Completeness
Consistency
Validity
Conformity
Accuracy Integrity
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The Data Warehouse stores the data which is used for analytical processing, but when frame the
Data Warehouse it face two essential questions:
1. How to reconcile the stream of incoming data from multiple heterogeneous sources?
2. How to customize the derived data storage to specific applications?
The design decision of Data Warehouse to solve the above two problems is depending on the
business needs, therefore in Data Warehouse design, the change management and design supports
play an important role. The following are the objectives of Data Warehouse Quality.
1. The Meta databases with formal models of information quality to enable adaptive and
quantitative design optimization of data warehouses.
2. The information resource models to enable more incremental change propagation and
conflict resolution.
3. The Data Warehouse schema models to enable designers and query optimizers to take
explicit advantage of the temporal, spatial and aggregate nature of DW data.
During the whole spectrum of the Data Warehouse modeling, design and development will be
focused on:
1. The Data Warehouse Quality framework and system architectures.
2. Data Warehouse Meta modeling and designing methods and languages.
3. Optimization.
To achieve the above objectives, a quality model can be designed for data. This quality model has
become specialized for the utility of Data Warehousing and has great emphasis on historical as
well as aggregated data.
Figure 2: Quality Factors In Data Warehousing
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5. Data Warehouse Quality Architecture:
While interpreting the Data Warehousing in more detail; any Data Warehouse component can be
analyzed in the conceptual perspective, logical perspective, and physical perspective.
Moreover in the design, operation, and in evolution of Data Warehouse, it is important that these
three perspectives are maintained consistent with each other. Finally quality factors are associated
with specific perspective or specific relationship between perspectives. The following diagram
represents how to link quality factors to Data Warehouse tasks.
Figure 3: Linking Quality Factors to Data Warehousing Tasks
5.1 Conceptual Perspective: In terms of Data Warehouse quality, the conceptual model defines
a theory of the organization. Actual observation can be evaluated for quality factors such as
accuracy, timeliness, completeness with respect to this theory. Moreover, the fact that data
warehouse views intervene between client views and source views can have both a positive
and a negative impact on information quality.
5.2 Logical Perspective: The logical perspective conceives a Data Warehouse from the view
point of the actual data models involved. Researchers and practitioners following this
perspective are the ones that consider a Data Warehouse simply a collection of materialized
views on top of each other, based on existing information sources.
5.3 Physical Perspective: The physical perspective interprets the data warehouse architecture as
a network of data stores, data transformers and communication channels, aiming at the
quality factors of reliability and performance in the presence of very large amounts of slowly
changing data.
The following diagram shows DW architecture within three perspectives.
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Figure 4: Three Aspects of Data Warehouse Architecture
6. Data Quality Tools:
It is known that 75% of the effort spent on data warehouse is attributed to back end issues, such
as readying the data and transporting it into the data warehouse. Now a days, hundreds of tools
are available to automate the tasks associated with auditing, cleansing, extracting and loading
data into data warehouses. The quality tools are emerging as a way to correct and clean data at
many stages in building and maintaining a data warehouse. These tools are used to audit the data
at the source, transform the data so that it is consistent throughout the warehouse, segment the
data into atomic units and ensure that the data matches the business rules. The tools can be stand
alone packages, or can be integrated with data warehouse packages.
The data quality tools generally fall into one of three categories: auditing, cleansing and
migration. The main focus of these tools is on cleaning and auditing and the data and extraction
cum migration data tools will have a limited look.
Data auditing tools enhance the accuracy and correctness of the data at the source. These tools
generally compare the data in the source database to a set of business rules. When using a source
external to the organization, business rules can be determined by using a source external to the
organization, business rules can be determined by using data mining techniques to uncover
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patterns in the data. Business rules that are internal to the organization should be entered in the
early stages of evaluating data sources. Lexical analysis may be used to discover the business
sense of words within the data. The data that does not adhere to the business rules could then be
modified as necessary.
Data cleansing tools are used in the intermediate staging area. The tools in this category have
been around for number of years. A data cleansing tool cleans names, addresses, and other data
that can be compared to an independent source. These tools are responsible for parsing,
standardizing and verifying data against known lists.
The third type of tool, the data migration tool, is used in extracting data from a source database,
and migrating the data into an intermediate storage area. The migration tools also transfer data
from the staging area into the data warehouse. The data migration tool is responsible for
converting the data from one platform to another. A migration tool will map the data from the
source to the data warehouse. It also checks for Y2K compliance and other simple cleansing
activities.
7. Data quality Standards
The data quality standards are useful to assess whether the requirements specified by the
customers are achieved or not. The following are data quality standard objectives.
2.4 Accessibility
2.5 Accuracy.
2.6 Timeliness.
2.7 Integrity.
2.8 Validity.
2.9 Consistency.
2.10 Relevance.
The data quality standards are meant for;
1. Making the decisions based on facts.
2. Useful to take corrective actions.
3. Useful in access source of quality problems.
4. Useful to estimate losses due to lack of quality.
5. Estimate or calculate the solutions which below and or above the intended goals.
6. To provide quality in solutions.
Let us consider the measurements for a specific problem or a product and then frame the quality
metrics, before actual data quality standards are defined. The data quality metrics should always
met the legal regulations, business rules, and urgent, special cases. The metrics defined to access
the information quality should satisfy the following criteria.
1. All metrics should frequently report about the quality control factors with in an
organization.
2. Define methods, which are used to controlling the metrics.
3. Each and every metric should consist of certain attributes such as metric name, metric
definition, calculation, data elements, and data source.
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8. Meta data based quality control system
To achieve high level data quality in data warehouse, let us consider the customer requirements,
participation of stack holders, and all most all aspects with in the organization. This is known as
the Total Quality Management (TQM). But to control the activities that are performed in the
assessment of quality. The organizational structure, functionalities and responsibilities with
continuous quality improvement are considered. To control the quality assessment activities
consider two things are considered.
1. Quality planning - Here select the criteria for quality assessment, classify it and assign
priorities to the controlling activities.
2. To measure the quality quantitatively.
In Meta data quality control system, first the information requirements or demands for quality
from the users are collected and then transform these requirements into specifications. The Meta
data Quality Control system (MQC) comprises the whole data warehouse architecture and the
quality will be measured along the data flow. The following is the architecture of MQC system.
Figure 5: Meta data Quality Architecture.
Conclusion:
It is well known that Extraction, Transformation and Loading (ETL) operations are important as
well as crucial in forming of Data warehouse. Let us consider maintaining the quality of data in
Data Warehouse, first of all extracting the information from various small operational databases
and then transforming the data into the schema model of Data Warehouse and finally load the
data into the Data Warehouse. During this entire process one of the key components is Meta data
repository which stores each and every characteristic of the data items loaded in the Data
Warehouse. Hence screening the Meta data, identifying the quality control problems, and then
applying quality standards on it leading to rectification of quality problems in Data Warehouse
frame work. In addition to this, the changes are proposed in the Data Warehouse architecture
DB-1
DB-2
DB-3
Extract, Clean,
Transform, Integrate
Data
Warehouse
Meta Data
User Quality Requirements
Quality
Statement
Notifications
Rule based
constraints
Data Quality
Analyst
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according to the quality control standards within Meta database. It leads to synchronization of the
operations of Meta database with in Data Warehouse architecture. In this paper, a new Meta data
quality architecture is proposed to overcome the data quality problems in Data Warehouse at the
bottom level of Data Warehouse formation.
The proposed data quality issues in data warehouse provides planning, data quality assessment
criteria, Total data Quality management, Classification data quality issues, data quality problems
in data warehouse, data warehouse structures how they effect the data quality, different data
quality tools, Quality control standards and Meta data quality control system.
References:
1. “Data quality tools for data warehousing – A small sample survey” available at www.ctg.albany.edu.
2. www.informatica.com/INFA_Resources/brief_dq _dw_bi_6702.pdf
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in data warehouse” International Journal of Computer Science Issues, Vol 7, Issue 3, No 2 May 2010.
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implementation”.
5. Markus Helfert and Clemens Herrmann “Proactive data quality management fir data warehouse
systems” available at http://datawarehouse.iwi.unisg.ch.
6. Philip Crosby “The high costs of low quality data” available at http://pdf4me.net/pdf-data/data-
warehouse-free-book.php.
7. Matthias Jarke and Yannis vassiliou “Data warehouse Quality: A review of the DWQ Project”.
8. http://iaidq.org/main
9. www.thearling.com/index.htm