This document discusses data preparation, which is an important step in the knowledge discovery process. It covers topics such as outliers, missing data, data transformation, and data types. The goal of data preparation is to transform raw data into a format that will best expose useful information and relationships to data mining algorithms. It aims to reduce errors and produce better and faster models. Common tasks involve data cleaning, discretization, integration, reduction and normalization.
Data preprocessing involves cleaning data by handling missing values, noisy data, and inconsistencies. It also includes data reduction techniques like discretization which reduce data volume while maintaining analytical results. The goals of preprocessing are to improve data quality, handle problems like incomplete, noisy, and inconsistent data for effective data mining and analysis.
Data preprocessing involves cleaning data by handling missing values, noisy data, and inconsistencies. It also includes data reduction techniques like discretization which reduce data volume while maintaining analytical results. The goals of preprocessing are to improve data quality, handle problems like incomplete, noisy, and inconsistent data for effective data mining and analysis.
This document discusses various techniques for data preprocessing including data cleaning, integration, transformation, reduction, discretization, and concept hierarchy generation. Data cleaning involves handling missing data, noisy data, and inconsistent data through techniques like filling in missing values, identifying outliers, and correcting errors. Data integration combines data from multiple sources and resolves issues like redundant or conflicting data. Data transformation techniques normalize data scales and construct new attributes. Data reduction methods like sampling, clustering, and histograms reduce data volume while maintaining analytical quality. Discretization converts continuous attributes to categorical bins. Concept hierarchies generalize data by grouping values into higher-level concepts.
Data pre-processing involves cleaning raw data by filling in missing values, removing noise, and resolving inconsistencies. It also includes integrating, transforming, and reducing data through techniques like normalization, aggregation, dimensionality reduction, and discretization. The goal of data pre-processing is to convert raw data into a clean, organized format suitable for modeling and analysis tasks like data mining and machine learning.
The document provides an overview of key concepts in data preprocessing including data cleaning, feature transformation, standardization and normalization. It discusses techniques such as handling missing values, binning noisy data, dimensionality reduction, discretizing continuous features, and different scaling methods like standardization, min-max scaling and robust scaling. Code examples are provided to demonstrate these preprocessing techniques on various datasets. Homework includes explaining z-score standardization and dimensionality reduction, and preprocessing the Titanic dataset through cleaning, standardization and normalization.
Data preprocessing is the process of preparing raw data for analysis by cleaning it, transforming it, and reducing it. The key steps in data preprocessing include data cleaning to handle missing values, outliers, and noise; data transformation techniques like normalization, discretization, and feature extraction; and data reduction methods like dimensionality reduction and sampling. Preprocessing ensures the data is consistent, accurate and suitable for building machine learning models.
Data preprocessing involves cleaning data by handling missing values, noisy data, and inconsistencies. It also includes data reduction techniques like discretization which reduce data volume while maintaining analytical results. The goals of preprocessing are to improve data quality, handle problems like incomplete, noisy, and inconsistent data for effective data mining and analysis.
Data preprocessing involves cleaning data by handling missing values, noisy data, and inconsistencies. It also includes data reduction techniques like discretization which reduce data volume while maintaining analytical results. The goals of preprocessing are to improve data quality, handle problems like incomplete, noisy, and inconsistent data for effective data mining and analysis.
This document discusses various techniques for data preprocessing including data cleaning, integration, transformation, reduction, discretization, and concept hierarchy generation. Data cleaning involves handling missing data, noisy data, and inconsistent data through techniques like filling in missing values, identifying outliers, and correcting errors. Data integration combines data from multiple sources and resolves issues like redundant or conflicting data. Data transformation techniques normalize data scales and construct new attributes. Data reduction methods like sampling, clustering, and histograms reduce data volume while maintaining analytical quality. Discretization converts continuous attributes to categorical bins. Concept hierarchies generalize data by grouping values into higher-level concepts.
Data pre-processing involves cleaning raw data by filling in missing values, removing noise, and resolving inconsistencies. It also includes integrating, transforming, and reducing data through techniques like normalization, aggregation, dimensionality reduction, and discretization. The goal of data pre-processing is to convert raw data into a clean, organized format suitable for modeling and analysis tasks like data mining and machine learning.
The document provides an overview of key concepts in data preprocessing including data cleaning, feature transformation, standardization and normalization. It discusses techniques such as handling missing values, binning noisy data, dimensionality reduction, discretizing continuous features, and different scaling methods like standardization, min-max scaling and robust scaling. Code examples are provided to demonstrate these preprocessing techniques on various datasets. Homework includes explaining z-score standardization and dimensionality reduction, and preprocessing the Titanic dataset through cleaning, standardization and normalization.
Data preprocessing is the process of preparing raw data for analysis by cleaning it, transforming it, and reducing it. The key steps in data preprocessing include data cleaning to handle missing values, outliers, and noise; data transformation techniques like normalization, discretization, and feature extraction; and data reduction methods like dimensionality reduction and sampling. Preprocessing ensures the data is consistent, accurate and suitable for building machine learning models.
The document discusses the key steps involved in data pre-processing for machine learning:
1. Data cleaning involves removing noise from data by handling missing values, smoothing outliers, and resolving inconsistencies.
2. Data transformation strategies include data aggregation, feature scaling, normalization, and feature selection to prepare the data for analysis.
3. Data reduction techniques like dimensionality reduction and sampling are used to reduce large datasets size by removing redundant features or clustering data while maintaining most of the information.
Presentation to the third LIS DREaM workshop, held at Edinburgh Napier university on Wednesday 25th April 2012.
More information about the event can be found at http://lisresearch.org/dream-project/dream-event-4-workshop-wednesday-25-april-2012/
Big Data LDN 2018: TIPS AND TRICKS TO WRANGLE BIG, DIRTY DATAMatt Stubbs
Date: 14th November 2018
Location: Data Ops Theatre
Time: 11:50 - 12:20
Speaker: Marion Azoulai
Organisation: TIBCO
About: Data science may be “one of the sexiest jobs of the 21st Century,” but it’s likely your most valuable analytics employees are spending too much time on the most mundane tasks: prepping data for analysis. Make it easy to clean and work with data to give time back to your analytics talent so they can focus on answering questions, solving problems, and discovering opportunities to innovate. Join this session to learn practical tips and tricks to significantly reduce the time needed to transform and wrangle data and leave more time for generating insights.
Creativity and Curiosity - The Trial and Error of Data ScienceDamianMingle
This document discusses the process of data science and machine learning model building. It begins by outlining the many options available at each step, from programming languages and visualization tools to model types and tuning techniques. It then describes a structured 5-step process for knowledge discovery: 1) define the goal, 2) explore the data, 3) prepare the data, 4) choose and evaluate models, and 5) ensemble techniques. For each step, it provides guidance on common tasks and considerations, such as identifying problems in the data, sampling techniques, evaluating model performance, and addressing overfitting. The overall message is that a curious yet structured approach can help remove uncertainty and ensure successful outcomes in data science projects.
Anomaly detection (Unsupervised Learning) in Machine LearningKuppusamy P
Anomaly detection techniques are used to identify rare items, events or observations which raise suspicions by differing significantly from the majority of the data. There are various types of anomalies including point anomalies, contextual anomalies and collective anomalies. Anomaly detection algorithms typically build a model of normal behavior and then label new data as normal or anomalous based on how well it fits the model. Common techniques include clustering, statistical methods and distance-based approaches. Applications include fraud detection, system failure diagnosis and cybersecurity.
This document provides an overview of exploratory data analysis (EDA). It discusses the key goals of EDA as understanding the characteristics of a dataset and selecting appropriate analysis tools. The document outlines common EDA tasks like calculating summary statistics, creating visualizations, and detecting patterns and anomalies. Specific techniques covered include frequency tables, measures of central tendency and spread, histograms, box plots, contingency tables, and scatter plots. The document emphasizes exploring one variable at a time before examining relationships between multiple variables to better understand the dataset.
Searching for Anomalies, by Thomas Dietterich, Distinguished Professor Emeritus in the School of EECS at Oregon State University and Chief Scientist of BigML.
*MLSEV 2020: Virtual Conference.
Data extraction, cleanup & transformation tools 29.1.16Dhilsath Fathima
Data preprocessing is an important step in the data mining process that involves transforming raw data into an understandable format. It includes tasks like data cleaning, integration, transformation, and reduction. Data cleaning identifies outliers, handles missing data and resolves inconsistencies. Data integration combines data from multiple sources. Transformation includes normalization and aggregation. Reduction techniques like binning, clustering, and sampling reduce data volume while maintaining analytical quality. Dimensionality reduction selects a minimum set of important features.
This document discusses module 3 on data pre-processing. It begins with an overview of data quality issues like accuracy, completeness, consistency and timeliness. The major tasks in data pre-processing are then summarized as data cleaning, integration, reduction, and transformation. Data cleaning techniques like handling missing values, noisy data and outliers are covered. The need for feature engineering and dimensionality reduction due to the curse of dimensionality is also highlighted. Finally, techniques for data integration, reduction and discretization are briefly introduced.
Data preprocessing involves cleaning, transforming, and reducing raw data to prepare it for further analysis. The key tasks in data preprocessing are data cleaning to handle missing values, noise, outliers and inconsistencies; data integration of multiple data sources; data transformation through normalization, aggregation, and attribute construction; data reduction to reduce data size through methods like binning, clustering and sampling; and data discretization to reduce continuous attribute values into intervals. Descriptive statistics like mean, median and histograms can help identify noise and outliers during data cleaning.
This document provides an overview of machine learning with Azure. It discusses various machine learning concepts like classification, regression, clustering and more. It outlines an agenda for a workshop on the topic that includes experiments in Azure ML Studio, publishing models as web services, and using various Azure data sources. The document encourages participants to clone a GitHub repo for sample code and data and to sign up for an Azure ML Studio account.
Data preprocessing involves cleaning data by handling missing values and outliers, integrating multiple data sources, and transforming data through normalization, aggregation, and dimension reduction. The goals are to improve data quality, handle inconsistencies, and reduce data volume for analysis. Major tasks include data cleaning, integration, transformation, reduction through methods like feature selection, clustering, sampling and discretization of continuous variables. Preprocessing comprises the majority of work in data mining projects.
Validate data
Questionnaire checking
Edit acceptable questionnaires
Code the questionnaires
Keypunch the data
Clean the data set
Statistically adjust the data
Store the data set for analysis
Analyse data
This document discusses various techniques for data preprocessing which is an important step in the knowledge discovery process. It covers why preprocessing is needed due to issues with real-world data being dirty, noisy, incomplete etc. The major tasks covered are data cleaning, integration, transformation and reduction. Specific techniques discussed include data cleaning methods like handling missing values, noisy data, and inconsistencies. Data integration addresses combining multiple sources and resolving conflicts. Transformation techniques include normalization, aggregation, and discretization. Data reduction aims to reduce volume while maintaining analytical quality using methods like cube aggregation, dimensionality reduction, and data compression.
This document provides an overview of key tasks in data preprocessing for knowledge discovery and data mining. It discusses why preprocessing is important, as real-world data is often dirty, noisy, incomplete, and inconsistent. The major tasks covered are data cleaning, integration, transformation, reduction, discretization, and generating concept hierarchies. Data cleaning involves techniques for handling missing data, noisy data, and inconsistencies. Data integration combines multiple data sources. Data transformation includes normalization, aggregation, and generalization. The goal of data reduction is to obtain a smaller yet similar representation, using techniques like cube aggregation, dimensionality reduction, sampling, and discretization.
The document discusses entity relationship modeling concepts including:
- Entities represent real-world objects or concepts that can exist independently
- Attributes describe entities with properties like simple or multi-valued attributes
- Relationships exist between entities when one entity's attribute refers to another's attribute
- Keys like primary keys and foreign keys are used to uniquely identify and relate entities
- Cardinality defines relationship types as one-to-one, one-to-many, or many-to-many
- Examples demonstrate applying these concepts to model systems like a university admissions system.
SDA presentation the basics of computer science .pptxImXaib
SDA stands for Source Data Automation. It is the process of using technology to automatically collect, process, and manage data without manual intervention. This improves data accuracy while reducing costs. The key steps in data automation are data capture, data parsing, data entry automation, data validation, and data anonymization. Implementing data automation can reduce processing time, lower overhead costs, improve data quality, and allow data processing to scale more easily.
The document discusses the key steps involved in data pre-processing for machine learning:
1. Data cleaning involves removing noise from data by handling missing values, smoothing outliers, and resolving inconsistencies.
2. Data transformation strategies include data aggregation, feature scaling, normalization, and feature selection to prepare the data for analysis.
3. Data reduction techniques like dimensionality reduction and sampling are used to reduce large datasets size by removing redundant features or clustering data while maintaining most of the information.
Presentation to the third LIS DREaM workshop, held at Edinburgh Napier university on Wednesday 25th April 2012.
More information about the event can be found at http://lisresearch.org/dream-project/dream-event-4-workshop-wednesday-25-april-2012/
Big Data LDN 2018: TIPS AND TRICKS TO WRANGLE BIG, DIRTY DATAMatt Stubbs
Date: 14th November 2018
Location: Data Ops Theatre
Time: 11:50 - 12:20
Speaker: Marion Azoulai
Organisation: TIBCO
About: Data science may be “one of the sexiest jobs of the 21st Century,” but it’s likely your most valuable analytics employees are spending too much time on the most mundane tasks: prepping data for analysis. Make it easy to clean and work with data to give time back to your analytics talent so they can focus on answering questions, solving problems, and discovering opportunities to innovate. Join this session to learn practical tips and tricks to significantly reduce the time needed to transform and wrangle data and leave more time for generating insights.
Creativity and Curiosity - The Trial and Error of Data ScienceDamianMingle
This document discusses the process of data science and machine learning model building. It begins by outlining the many options available at each step, from programming languages and visualization tools to model types and tuning techniques. It then describes a structured 5-step process for knowledge discovery: 1) define the goal, 2) explore the data, 3) prepare the data, 4) choose and evaluate models, and 5) ensemble techniques. For each step, it provides guidance on common tasks and considerations, such as identifying problems in the data, sampling techniques, evaluating model performance, and addressing overfitting. The overall message is that a curious yet structured approach can help remove uncertainty and ensure successful outcomes in data science projects.
Anomaly detection (Unsupervised Learning) in Machine LearningKuppusamy P
Anomaly detection techniques are used to identify rare items, events or observations which raise suspicions by differing significantly from the majority of the data. There are various types of anomalies including point anomalies, contextual anomalies and collective anomalies. Anomaly detection algorithms typically build a model of normal behavior and then label new data as normal or anomalous based on how well it fits the model. Common techniques include clustering, statistical methods and distance-based approaches. Applications include fraud detection, system failure diagnosis and cybersecurity.
This document provides an overview of exploratory data analysis (EDA). It discusses the key goals of EDA as understanding the characteristics of a dataset and selecting appropriate analysis tools. The document outlines common EDA tasks like calculating summary statistics, creating visualizations, and detecting patterns and anomalies. Specific techniques covered include frequency tables, measures of central tendency and spread, histograms, box plots, contingency tables, and scatter plots. The document emphasizes exploring one variable at a time before examining relationships between multiple variables to better understand the dataset.
Searching for Anomalies, by Thomas Dietterich, Distinguished Professor Emeritus in the School of EECS at Oregon State University and Chief Scientist of BigML.
*MLSEV 2020: Virtual Conference.
Data extraction, cleanup & transformation tools 29.1.16Dhilsath Fathima
Data preprocessing is an important step in the data mining process that involves transforming raw data into an understandable format. It includes tasks like data cleaning, integration, transformation, and reduction. Data cleaning identifies outliers, handles missing data and resolves inconsistencies. Data integration combines data from multiple sources. Transformation includes normalization and aggregation. Reduction techniques like binning, clustering, and sampling reduce data volume while maintaining analytical quality. Dimensionality reduction selects a minimum set of important features.
This document discusses module 3 on data pre-processing. It begins with an overview of data quality issues like accuracy, completeness, consistency and timeliness. The major tasks in data pre-processing are then summarized as data cleaning, integration, reduction, and transformation. Data cleaning techniques like handling missing values, noisy data and outliers are covered. The need for feature engineering and dimensionality reduction due to the curse of dimensionality is also highlighted. Finally, techniques for data integration, reduction and discretization are briefly introduced.
Data preprocessing involves cleaning, transforming, and reducing raw data to prepare it for further analysis. The key tasks in data preprocessing are data cleaning to handle missing values, noise, outliers and inconsistencies; data integration of multiple data sources; data transformation through normalization, aggregation, and attribute construction; data reduction to reduce data size through methods like binning, clustering and sampling; and data discretization to reduce continuous attribute values into intervals. Descriptive statistics like mean, median and histograms can help identify noise and outliers during data cleaning.
This document provides an overview of machine learning with Azure. It discusses various machine learning concepts like classification, regression, clustering and more. It outlines an agenda for a workshop on the topic that includes experiments in Azure ML Studio, publishing models as web services, and using various Azure data sources. The document encourages participants to clone a GitHub repo for sample code and data and to sign up for an Azure ML Studio account.
Data preprocessing involves cleaning data by handling missing values and outliers, integrating multiple data sources, and transforming data through normalization, aggregation, and dimension reduction. The goals are to improve data quality, handle inconsistencies, and reduce data volume for analysis. Major tasks include data cleaning, integration, transformation, reduction through methods like feature selection, clustering, sampling and discretization of continuous variables. Preprocessing comprises the majority of work in data mining projects.
Validate data
Questionnaire checking
Edit acceptable questionnaires
Code the questionnaires
Keypunch the data
Clean the data set
Statistically adjust the data
Store the data set for analysis
Analyse data
This document discusses various techniques for data preprocessing which is an important step in the knowledge discovery process. It covers why preprocessing is needed due to issues with real-world data being dirty, noisy, incomplete etc. The major tasks covered are data cleaning, integration, transformation and reduction. Specific techniques discussed include data cleaning methods like handling missing values, noisy data, and inconsistencies. Data integration addresses combining multiple sources and resolving conflicts. Transformation techniques include normalization, aggregation, and discretization. Data reduction aims to reduce volume while maintaining analytical quality using methods like cube aggregation, dimensionality reduction, and data compression.
This document provides an overview of key tasks in data preprocessing for knowledge discovery and data mining. It discusses why preprocessing is important, as real-world data is often dirty, noisy, incomplete, and inconsistent. The major tasks covered are data cleaning, integration, transformation, reduction, discretization, and generating concept hierarchies. Data cleaning involves techniques for handling missing data, noisy data, and inconsistencies. Data integration combines multiple data sources. Data transformation includes normalization, aggregation, and generalization. The goal of data reduction is to obtain a smaller yet similar representation, using techniques like cube aggregation, dimensionality reduction, sampling, and discretization.
The document discusses entity relationship modeling concepts including:
- Entities represent real-world objects or concepts that can exist independently
- Attributes describe entities with properties like simple or multi-valued attributes
- Relationships exist between entities when one entity's attribute refers to another's attribute
- Keys like primary keys and foreign keys are used to uniquely identify and relate entities
- Cardinality defines relationship types as one-to-one, one-to-many, or many-to-many
- Examples demonstrate applying these concepts to model systems like a university admissions system.
SDA presentation the basics of computer science .pptxImXaib
SDA stands for Source Data Automation. It is the process of using technology to automatically collect, process, and manage data without manual intervention. This improves data accuracy while reducing costs. The key steps in data automation are data capture, data parsing, data entry automation, data validation, and data anonymization. Implementing data automation can reduce processing time, lower overhead costs, improve data quality, and allow data processing to scale more easily.
terminal a clear presentation on the topic.pptxImXaib
The document discusses different types of terminals including dumb terminals, intelligent terminals, smart terminals, local terminals, remote terminals, and point-of-sale (POS) terminals. A terminal is a device that performs both input and output and is used to send and receive data from a central computer. Terminals allow multiple users to access a computer simultaneously. Dumb terminals have limited functions and depend on the central computer, while intelligent terminals can process, store, and transmit data independently. Smart terminals are used for checkouts and payments. Local terminals connect directly to the central computer while remote terminals connect via telecommunication lines. POS terminals record purchases and input data to the host computer.
What is Machine Learning_updated documents.pptxImXaib
This document provides an introduction to machine learning. It is presented by Dr. Muhammad Umar Chaudhry and discusses key concepts including what learning is, examples of machine learning applications, and different types of machine learning problems. The document also outlines the key ingredients needed for machine learning, including data, experience, and a learning model. It describes different types of learning methods such as supervised, unsupervised, semi-supervised, and reinforcement learning.
Grid computing allows for sharing and distribution of computing power, data, and other resources across dynamic, decentralized networks. It provides transparent access to resources regardless of location, enabling applications to execute on the most appropriate systems. The key advantages are increased user productivity through faster completion of work, and scalability to grow computing power seamlessly over time. Grids have various applications including distributed supercomputing, high-throughput computing, and data-intensive computing.
This document provides an overview of firewalls, including what they are, different types, basic concepts, their role, advantages, and disadvantages. It defines a firewall as a program or device that filters network traffic between the internet and a private network based on a set of rules. The document discusses software vs hardware firewalls and different types like packet filtering, application-level gateways, and circuit-level gateways. It also covers the history of firewalls, their design goals, and how they concentrate security and restrict access to trusted machines only.
This document provides an overview of configuring and administering remote access services in Windows Server 2003. It discusses configuring remote access and VPN connections using dial-up connections and VPN protocols like PPTP and L2TP. It also covers implementing and troubleshooting remote access policies, network address translation (NAT), and Internet connection sharing to provide remote access to network resources.
Integrity constraints are an important functionality of a DBMS that enable specification and enforcement of constraints. Examples include keys, foreign keys, and domain constraints. Keys uniquely identify tuples in a relation. Foreign keys require attributes of one relation to refer to keys of another relation. Functional dependencies specify that tuples agreeing on certain attributes must also agree on other attributes. Normalization aims to remove anomalies from relations by decomposing them according to dependencies. Relational algebra and calculus provide languages for querying relational databases. SQL is the most common language, allowing selection, projection, joins, and other operations on relations.
Microsoft Network Monitor is a packet analyzer that allows users to capture, view, and analyze network traffic through support for over 300 protocols and simultaneous capture sessions. Nagios is a powerful network monitoring tool that helps ensure critical systems, applications, and services remain operational through features like alerting, event handling, and reporting. Angry IP Scanner is a standalone application that facilitates IP address and port scanning to obtain information about alive hosts on a network.
This document discusses network operating systems and remote access. It covers two categories of network operating systems: peer-to-peer and client/server. Peer-to-peer NOSes lacked centralized authentication and scalability. Client/server NOSes use a server-based model. The document also discusses requirements of modern NOSes like application services, directory services, and integration/migration services. It covers remote access methods like remote control, tunneling protocols, and VPNs which allow remote clients to securely access enterprise networks.
This document provides an overview of telecommunication systems, including basic telephone systems, private branch exchanges (PBXs), interactive voice response systems, leased line services like T-1 and ISDN, and packet-switched networks like frame relay and asynchronous transfer mode (ATM). It discusses the components and functions of traditional telephone networks and how voice and data communications have converged. It also summarizes the historical regulatory changes in the US telephone industry before and after the AT&T breakup in 1984 and the Telecommunications Act of 1996.
Full virtualization uses binary translation to virtualize privileged instructions without modifying the guest OS, but has performance overhead. Paravirtualization modifies the guest OS kernel to replace privileged calls with hypercalls for better performance. Hardware virtualization extensions in Intel VT-x and AMD-V allow virtualizing privileged instructions in hardware. Memory virtualization uses shadow page tables to map guest physical to host physical memory. I/O virtualization presents virtual devices to VMs and translates requests to physical hardware. VMWare uses optimized direct drivers in ESXi for better I/O scalability compared to Xen's indirect driver model.
This document provides an overview of telecommunications, networks, and the Internet. It discusses contemporary corporate network infrastructures, key networking technologies like client/server computing and TCP/IP, different types of networks and transmission media, broadband services, the architecture and governance of the Internet, and how networking and telecommunications have transformed business. The role of the Internet and importance of networking is illustrated through statistics on Internet usage and the value networks provide by enabling improved decision-making and reducing barriers.
IPSec uses two protocols to provide security for IP packets: the Encapsulating Security Payload (ESP) and Authentication Header (AH). ESP provides both encryption and authentication, and can operate in either transport or tunnel mode. AH provides authentication through cryptographic integrity checks on packet headers and data. Internet Key Exchange (IKE) negotiates the security associations (SAs) needed to implement IPSec by using either pre-shared keys or digital certificates. IKE has two phases - main mode negotiates the IKE SA while quick mode establishes IPSec SAs to protect data transmission.
The document discusses the importance of establishing an information security policy and provides guidance on developing policy at the enterprise, issue-specific, and system-specific levels. It emphasizes that policy provides the foundation for an effective security program and must be properly disseminated, understood, and maintained. It also outlines frameworks and processes for developing, implementing, and routinely reviewing policy to address changing needs.
The document discusses key concepts in database systems including data, information, databases, database management systems, and data redundancy, inconsistency, sharing, security, and integrity. It also covers levels of database implementation including the internal, conceptual, and external levels. Relational data models and basic terminology are defined. Relational algebra operators like selection, projection, Cartesian product, union, set difference, and set intersection are explained. Finally, some disadvantages of database systems are noted.
This document discusses various protocols for securing network communications, including SSL/TLS, HTTPS, and SSH. It provides details on how SSL/TLS uses encryption and authentication to provide secure connections between a client and server. It also explains how HTTPS combines HTTP and SSL/TLS to securely transmit web traffic, and how SSH establishes secure channels for remote login and forwarding of network traffic.
This document discusses applications and trends in data mining. It provides examples of data mining applications in various domains including financial data analysis, retail industry, telecommunications industry, and biological data analysis. It also discusses selecting appropriate data mining systems and provides examples of commercial data mining systems. Finally, it introduces the concept of visual data mining and the role of visualization in the data mining process.
This document discusses attacking and defending wireless networks. It outlines common wireless encryption standards like WEP, WPA, and WPA2 and explains how they can be attacked using tools like airodump and aircrack to capture passwords or decrypt encryption keys. The document recommends strong defenses like using long complex passphrases with WPA2, changing default router settings, restricting access by MAC address, and implementing a VPN for sensitive traffic.
This document discusses various methods for visualizing data, including representing data in 1, 2, and 3 dimensions as well as higher dimensions using techniques like parallel coordinates, scatterplots, stick figures, and Chernoff faces. It highlights principles of graphical excellence like showing viewers the greatest amount of information in the smallest space while telling the truth about the data. Examples are given of both good and bad data visualizations.
THE SACRIFICE HOW PRO-PALESTINE PROTESTS STUDENTS ARE SACRIFICING TO CHANGE T...indexPub
The recent surge in pro-Palestine student activism has prompted significant responses from universities, ranging from negotiations and divestment commitments to increased transparency about investments in companies supporting the war on Gaza. This activism has led to the cessation of student encampments but also highlighted the substantial sacrifices made by students, including academic disruptions and personal risks. The primary drivers of these protests are poor university administration, lack of transparency, and inadequate communication between officials and students. This study examines the profound emotional, psychological, and professional impacts on students engaged in pro-Palestine protests, focusing on Generation Z's (Gen-Z) activism dynamics. This paper explores the significant sacrifices made by these students and even the professors supporting the pro-Palestine movement, with a focus on recent global movements. Through an in-depth analysis of printed and electronic media, the study examines the impacts of these sacrifices on the academic and personal lives of those involved. The paper highlights examples from various universities, demonstrating student activism's long-term and short-term effects, including disciplinary actions, social backlash, and career implications. The researchers also explore the broader implications of student sacrifices. The findings reveal that these sacrifices are driven by a profound commitment to justice and human rights, and are influenced by the increasing availability of information, peer interactions, and personal convictions. The study also discusses the broader implications of this activism, comparing it to historical precedents and assessing its potential to influence policy and public opinion. The emotional and psychological toll on student activists is significant, but their sense of purpose and community support mitigates some of these challenges. However, the researchers call for acknowledging the broader Impact of these sacrifices on the future global movement of FreePalestine.
Andreas Schleicher presents PISA 2022 Volume III - Creative Thinking - 18 Jun...EduSkills OECD
Andreas Schleicher, Director of Education and Skills at the OECD presents at the launch of PISA 2022 Volume III - Creative Minds, Creative Schools on 18 June 2024.
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
Confiscations, Kotahitanga, Kingitanga, Parliament, Suffrage, Repudiation, Economic Change, Agriculture, Gold Mining, Timber, Flax, Sheep, Dairying,
This presentation was provided by Rebecca Benner, Ph.D., of the American Society of Anesthesiologists, for the second session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session Two: 'Expanding Pathways to Publishing Careers,' was held June 13, 2024.
This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
Healing can occur in two ways: Regeneration and Repair
There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...TechSoup
Whether you're new to SEO or looking to refine your existing strategies, this webinar will provide you with actionable insights and practical tips to elevate your nonprofit's online presence.
🔥🔥🔥🔥🔥🔥🔥🔥🔥
إضغ بين إيديكم من أقوى الملازم التي صممتها
ملزمة تشريح الجهاز الهيكلي (نظري 3)
💀💀💀💀💀💀💀💀💀💀
تتميز هذهِ الملزمة بعِدة مُميزات :
1- مُترجمة ترجمة تُناسب جميع المستويات
2- تحتوي على 78 رسم توضيحي لكل كلمة موجودة بالملزمة (لكل كلمة !!!!)
#فهم_ماكو_درخ
3- دقة الكتابة والصور عالية جداً جداً جداً
4- هُنالك بعض المعلومات تم توضيحها بشكل تفصيلي جداً (تُعتبر لدى الطالب أو الطالبة بإنها معلومات مُبهمة ومع ذلك تم توضيح هذهِ المعلومات المُبهمة بشكل تفصيلي جداً
5- الملزمة تشرح نفسها ب نفسها بس تكلك تعال اقراني
6- تحتوي الملزمة في اول سلايد على خارطة تتضمن جميع تفرُعات معلومات الجهاز الهيكلي المذكورة في هذهِ الملزمة
واخيراً هذهِ الملزمة حلالٌ عليكم وإتمنى منكم إن تدعولي بالخير والصحة والعافية فقط
كل التوفيق زملائي وزميلاتي ، زميلكم محمد الذهبي 💊💊
🔥🔥🔥🔥🔥🔥🔥🔥🔥
How Barcodes Can Be Leveraged Within Odoo 17Celine George
In this presentation, we will explore how barcodes can be leveraged within Odoo 17 to streamline our manufacturing processes. We will cover the configuration steps, how to utilize barcodes in different manufacturing scenarios, and the overall benefits of implementing this technology.
4. Why Prepare Data?
4
• Some data preparation is needed for all mining tools
• The purpose of preparation is to transform data sets
so that their information content is best exposed to
the mining tool
• Error prediction rate should be lower (or the same)
after the preparation as before it
5. Why Prepare Data?
5
• Preparing data also prepares the miner so that when
using prepared data the miner produces better
models, faster
• GIGO - good data is a prerequisite for producing
effective models of any type
6. Why Prepare Data?
6
• Data need to be formatted for a given software tool
• Data need to be made adequate for a given method
• Data in the real world is dirty
• incomplete: lacking attribute values, lacking certain attributes of interest, or
containing only aggregate data
• e.g., occupation=“”
• noisy: containing errors or outliers
• e.g., Salary=“-10”, Age=“222”
• inconsistent: containing discrepancies in codes or names
• e.g., Age=“42” Birthday=“03/07/1997”
• e.g., Was rating “1,2,3”, now rating “A, B, C”
• e.g., discrepancy between duplicate records
• e.g., Endereço: travessa da Igreja de Nevogilde Freguesia: Paranhos
7. Major Tasks in Data Preparation
7
• Data discretization
• Part of data reduction but with particular importance, especially for numerical data
• Data cleaning
• Fill in missing values, smooth noisy data, identify or remove outliers, and resolve
inconsistencies
• Data integration
• Integration of multiple databases, data cubes, or files
• Data transformation
• Normalization and aggregation
• Data reduction
• Obtains reduced representation in volume but produces the same or similar analytical
results
8. Data Preparation as a step in the
Knowledge Discovery Process
Cleaning and
Integration
Selection and
Transformation
Data Mining
Evaluation and
Presentation
Knowledge
DB
DW
8
10. Types of Measurements
• Nominal scale
• Categorical scale
• Ordinal scale
• Interval scale
• Ratio scale
Qualitative
Quantitative
More
information
content
Discrete or Continuous
10
11. Types of Measurements: Examples
11
• Nominal:
• ID numbers, Names of people
• Categorical:
• eye color, zip codes
• Ordinal:
• rankings (e.g., taste of potato chips on a scale from 1-10), grades,
height in {tall, medium, short}
• Interval:
• calendar dates, temperatures in Celsius or Fahrenheit, GRE
(Graduate Record Examination) and IQ scores
• Ratio:
• temperature in Kelvin, length, time, counts
12. 20
Data Conversion
• Some tools can deal with nominal values but other need
fields to be numeric
• Convert ordinal fields to numeric to be able to use “>”
and “<“ comparisons on such fields.
• A 4.0
• A- 3.7
• B+ 3.3
• B 3.0
• Multi-valued, unordered attributes with small no. of
values
• e.g. Color=Red, Orange, Yellow, …, Violet
• for each value v create a binary “flag” variable C_v , which is 1 if
Color=v, 0 otherwise
13. Conversion: Nominal, Many Values
13
• Examples:
• US State Code (50 values)
• Profession Code (7,000 values, but only few frequent)
• Ignore ID-like fields whose values are unique for each record
• For other fields, group values “naturally”:
• e.g. 50 US States 3 or 5 regions
• Profession – select most frequent ones, group the rest
• Create binary flag-fields for selected values
15. Outliers
15
• Outliers are values thought to be out of range.
• “An outlier is an observation that deviates so much from other
observations as to arouse suspicion that it was generated by a
different mechanism”
• Can be detected by standardizing observations and label the
standardized values outside a predetermined bound as outliers
• Outlier detection can be used for fraud detection or data cleaning
• Approaches:
• do nothing
• enforce upper and lower bounds
• let binning handle the problem
16. Outlier detection
• Univariate
• Compute mean and std. deviation. For k=2 or 3, x is an outlier
if outside limits (normal distribution assumed)
(x ks, x ks)
16
18. 44
Outlier detection
• Univariate
• Boxplot: An observation is an extreme outlier if
(Q1-3IQR, Q3+3IQR), where IQR=Q3-Q1
(IQR = Inter Quartile Range)
and declared a mild outlier if it lies
outside of the interval
(Q1-1.5IQR, Q3+1.5IQR).
http://www.physics.csbsju.edu/stats/box2.html
25. Normalization
25
• For distance-based methods, normalization
helps to prevent that attributes with large
ranges out-weight attributes with small
ranges
• min-max normalization
• z-score normalization
• normalization by decimal scaling
26. Normalization
• min-max normalization
• z-score normalization
v minv
(new _maxv new_min )
v new_minv
maxv minv
v'
v
• normalization by decimal scaling
v '
v v
v
10j
v'
Where j is the smallest integer such that Max(| v' |)<1
range: -986 to 917 => j=3 -986 -> -0.986 917 -> 0.917
26
does not eliminate outliers
29. Missing Data
29
• Data is not always available
• E.g., many tuples have no recorded value for several attributes, such as
customer income in sales data
• Missing data may be due to
• equipment malfunction
• inconsistent with other recorded data and thus deleted
• data not entered due to misunderstanding
• certain data may not be considered important at the time of entry
• not register history or changes of the data
• Missing data may need to be inferred.
• Missing values may carry some information content: e.g. a credit
application may carry information by noting which field the applicant did
not complete
30. Missing Values
30
• There are always MVs in a real dataset
• MVs may have an impact on modelling, in fact, they can destroy it!
• Some tools ignore missing values, others use some metric to fill in
replacements
• The modeller should avoid default automated replacement techniques
• Difficult to know limitations, problems and introduced bias
• Replacing missing values without elsewhere capturing that
information removes information from the dataset
31. How to Handle Missing Data?
31
• Ignore records (use only cases with all values)
• Usually done when class label is missing as most prediction methods
do not handle missing data well
• Not effective when the percentage of missing values per attribute
varies considerably as it can lead to insufficient and/or biased
sample sizes
• Ignore attributes with missing values
• Use only features (attributes) with all values (may leave out
important features)
• Fill in the missing value manually
• tedious + infeasible?
32. How to Handle Missing Data?
32
• Use a global constant to fill in the missing value
• e.g., “unknown”. (May create a new class!)
• Use the attribute mean to fill in the missing value
• It will do the least harm to the mean of existing data
• If the mean is to be unbiased
• What if the standard deviation is to be unbiased?
• Use the attribute mean for all samples belonging to the same
class to fill in the missing value
33. How to Handle Missing Data?
33
• Use the most probable value to fill in the missing value
• Inference-based such as Bayesian formula or decision tree
• Identify relationships among variables
• Linear regression, Multiple linear regression, Nonlinear regression
• Nearest-Neighbour estimator
• Finding the k neighbours nearest to the point and fill in the most
frequent value or the average value
• Finding neighbours in a large dataset may be slow
35. How to Handle Missing Data?
35
• Note that, it is as important to avoid adding bias and distortion
to the data as it is to make the information available.
• bias is added when a wrong value is filled-in
• No matter what techniques you use to conquer the problem, it
comes at a price. The more guessing you have to do, the further
away from the real data the database becomes. Thus, in turn, it
can affect the accuracy and validation of the mining results.
36. Summary
36
• Every real world data set needs some kind of data
pre-processing
• Deal with missing values
• Correct erroneous values
• Select relevant attributes
• Adapt data set format to the software tool to be used
• In general, data pre-processing consumes more than
60% of a data mining project effort
37. References
37
• ‘Data preparation for data mining’, Dorian Pyle, 1999
• ‘Data Mining: Concepts and Techniques’, Jiawei Han and Micheline
Kamber, 2000
• ‘Data Mining: Practical Machine Learning Tools and Techniques
with Java Implementations’, Ian H. Witten and Eibe Frank, 1999
• ‘Data Mining: Practical Machine Learning Tools and Techniques
second edition’, Ian H. Witten and Eibe Frank, 2005
• DM: Introduction: Machine Learning and Data Mining, Gregory
Piatetsky-Shapiro and Gary Parker
(http://www.kdnuggets.com/data_mining_course/dm1-introduction-ml-data-mining.ppt)
• ESMA 6835 Mineria de Datos (http://math.uprm.edu/~edgar/dm8.ppt)