This document outlines different types of experimental research designs, including true experimental, quasi-experimental, and pre-experimental designs. It discusses key elements like manipulation of independent variables, use of control groups, and randomization. True experiments aim to establish causation and include random assignment to groups. Quasi-experiments are similar but lack random assignment or a control group. Pre-experiments are the weakest design with no control groups or random assignment. Several specific experimental designs are described like post-test only, pre-test post-test, and randomized block designs. Advantages and disadvantages of different designs are also presented.
This document discusses research design and approaches. It begins by distinguishing between research design and research approach, with research design being the broader plan for conducting a study and research approach being an important element within the design. The key elements of a research design are then outlined, including the approach, population/sampling, data collection methods, time/place of collection, and data analysis method. The document goes on to classify and describe different types of research approaches, with a focus on quantitative and qualitative approaches as well as experimental and non-experimental designs. Specific experimental designs like true experimental, quasi-experimental, and pre-experimental are defined.
The document discusses the scientific method and variables. It explains that variables are the building blocks of hypotheses and can have different definitions, functions, and measurement scales. The key types of variables are independent, dependent, and control, and variables should be operationally defined whenever possible to make constructs measurable.
This document discusses experimental and quasi-experimental designs. It outlines the key components of classical experimental designs, including independent and dependent variables, experimental and control groups, pretesting and posttesting. It also discusses threats to internal and external validity and variations like quasi-experimental designs that use nonequivalent groups or time series when randomization is not possible. Quasi-experiments aim to make groups as comparable as possible through matching or using natural cohorts.
The document discusses various sampling techniques used in qualitative research. It begins by defining key sampling concepts like sampling frame, sample design, and sample size. It then outlines prerequisites to consider for sampling like research objectives, target population, and budget. The main types of sampling covered are probabilistic, non-probabilistic, and mixed. Specific non-probabilistic strategies discussed include purposive sampling, convenience sampling, and quota sampling. The document concludes by noting biases that can occur in sampling and emphasizing that non-probabilistic techniques are commonly used in qualitative research.
The document discusses experimental research design. It defines experimental research design as manipulating an independent variable to determine its causal effect on a dependent variable. It describes three types of experimental designs - true experiments where the researcher controls all variables, quasi-experiments where some control is given up for feasibility, and pre-experiments with no control over variables. Several specific experimental designs are also outlined, including post-test only, pre-test post-test, and randomized block designs. Key aspects of experiments like manipulation, control, and random selection are defined.
This document discusses research methodology and sampling techniques. It covers key topics such as census versus sample surveys, sampling design, steps in sampling design including defining the population, sampling unit, sample size, and sampling procedure. Factors that could lead to systematic bias are also outlined. The goal in selecting a sampling procedure is to minimize both systematic bias and sampling error while considering costs. Choosing an appropriate sampling technique is an important part of developing a reliable research methodology.
The document discusses research design. It defines research design as a blueprint that outlines how, where, and on whom a research study will be conducted. Experimental research design specifically examines the effect of independent variables on dependent variables by manipulating the independent variable. True experimental designs allow researchers to control extraneous variables and isolate the effect of the independent variable on the dependent variable. Several true experimental designs are described including post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs.
Comparison between qualitative and quantitative researchNurse Dianne
Qualitative methods such as focus groups, interviews, and document reviews are used to understand themes through an inductive process and subjective point of view, providing in-depth information on a few cases. Quantitative methods like surveys, structured interviews, and records reviews use deductive testing of concepts through statistical analysis of numeric data to generalize results across a large number of cases in a more objective manner. Both can be valid and reliable depending on the rigor of the research process and instruments used, but qualitative requires more analysis time while quantitative needs more planning.
This document discusses research design and approaches. It begins by distinguishing between research design and research approach, with research design being the broader plan for conducting a study and research approach being an important element within the design. The key elements of a research design are then outlined, including the approach, population/sampling, data collection methods, time/place of collection, and data analysis method. The document goes on to classify and describe different types of research approaches, with a focus on quantitative and qualitative approaches as well as experimental and non-experimental designs. Specific experimental designs like true experimental, quasi-experimental, and pre-experimental are defined.
The document discusses the scientific method and variables. It explains that variables are the building blocks of hypotheses and can have different definitions, functions, and measurement scales. The key types of variables are independent, dependent, and control, and variables should be operationally defined whenever possible to make constructs measurable.
This document discusses experimental and quasi-experimental designs. It outlines the key components of classical experimental designs, including independent and dependent variables, experimental and control groups, pretesting and posttesting. It also discusses threats to internal and external validity and variations like quasi-experimental designs that use nonequivalent groups or time series when randomization is not possible. Quasi-experiments aim to make groups as comparable as possible through matching or using natural cohorts.
The document discusses various sampling techniques used in qualitative research. It begins by defining key sampling concepts like sampling frame, sample design, and sample size. It then outlines prerequisites to consider for sampling like research objectives, target population, and budget. The main types of sampling covered are probabilistic, non-probabilistic, and mixed. Specific non-probabilistic strategies discussed include purposive sampling, convenience sampling, and quota sampling. The document concludes by noting biases that can occur in sampling and emphasizing that non-probabilistic techniques are commonly used in qualitative research.
The document discusses experimental research design. It defines experimental research design as manipulating an independent variable to determine its causal effect on a dependent variable. It describes three types of experimental designs - true experiments where the researcher controls all variables, quasi-experiments where some control is given up for feasibility, and pre-experiments with no control over variables. Several specific experimental designs are also outlined, including post-test only, pre-test post-test, and randomized block designs. Key aspects of experiments like manipulation, control, and random selection are defined.
This document discusses research methodology and sampling techniques. It covers key topics such as census versus sample surveys, sampling design, steps in sampling design including defining the population, sampling unit, sample size, and sampling procedure. Factors that could lead to systematic bias are also outlined. The goal in selecting a sampling procedure is to minimize both systematic bias and sampling error while considering costs. Choosing an appropriate sampling technique is an important part of developing a reliable research methodology.
The document discusses research design. It defines research design as a blueprint that outlines how, where, and on whom a research study will be conducted. Experimental research design specifically examines the effect of independent variables on dependent variables by manipulating the independent variable. True experimental designs allow researchers to control extraneous variables and isolate the effect of the independent variable on the dependent variable. Several true experimental designs are described including post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs.
Comparison between qualitative and quantitative researchNurse Dianne
Qualitative methods such as focus groups, interviews, and document reviews are used to understand themes through an inductive process and subjective point of view, providing in-depth information on a few cases. Quantitative methods like surveys, structured interviews, and records reviews use deductive testing of concepts through statistical analysis of numeric data to generalize results across a large number of cases in a more objective manner. Both can be valid and reliable depending on the rigor of the research process and instruments used, but qualitative requires more analysis time while quantitative needs more planning.
The document discusses research design and its key principles. It defines research design as a plan or blueprint for conducting a study that maximizes control over interfering factors and validity of findings. Some key points made:
- Research design refers to how a study will be conducted, the type of data collected, and means used to obtain the data.
- Reliability refers to consistency of data, while validity refers to accuracy and truth of measurements.
- Threats to validity include history, selection, testing, instrumentation, maturation, and mortality.
- Descriptive, experimental, and qualitative designs are three basic types of research design.
This document discusses quasi-experimental research designs. It defines quasi-experiments as resembling true experiments but lacking full control, such as random assignment. It describes various quasi-experimental designs including one group pre-test post-test, non-equivalent control group, interrupted time series, and time series with non-equivalent controls. Examples are provided of each design along with threats to validity. Common uses of quasi-experiments are discussed as well as advantages such as being able to be conducted in natural settings.
The document discusses grounded theory method and provides details on its key aspects:
- It defines grounded theory as a research method that generates or discovers a theory from data systematically obtained from social research.
- The main building blocks of grounded theory are discussed including coding, categories, concepts, theoretical sampling, constant comparison and memo writing.
- Strengths are that it effectively builds new theories and explains new phenomena, while weaknesses include the huge amount of time and data required for analysis.
This document defines and describes different types of experimental research designs. It discusses true experimental research, quasi-experimental research, pre-experimental research, and factorial designs. For each type of experimental research, it provides examples and discusses advantages and disadvantages. It also outlines several threats to validity that can occur in experimental research, such as history, maturation, testing, instrumentation, and more. Finally, it briefly discusses ex post facto research and provides a concluding remark on experimental research.
This document provides an overview of nonexperimental research design. It begins with definitions of nonexperimental research as research that observes phenomena as they naturally occur without introducing external variables or controlling settings. The document then discusses reasons for using nonexperimental design such as when variables cannot be ethically or practically manipulated. It also outlines various types of nonexperimental research design including surveys, Delphi surveys, correlation design, methodological studies, and comparative studies.
The document provides an overview of quantitative research methodology. It discusses key concepts including population, sampling, samples, and qualitative scales. Specifically, it defines population as any complete group with at least one characteristic in common. It explains that sampling is used to select a subset of a population for a study. The document also outlines different types of measurement scales in quantitative research including nominal, ordinal, interval, and ratio scales.
The document discusses different types of research designs, including explanatory trials which aim to study efficacy under ideal conditions, pragmatic trials which aim to study effectiveness in regular clinical practice, and cost benefit studies which aim to study efficiency in relation to resources consumed. It also discusses analytical studies, experimental trials using control groups, randomized controlled trials including group comparative and cross-over designs, non-randomized controlled trials, uncontrolled clinical trials, cohort studies, cross-sectional studies, and case control studies. The key aspects of each design such as whether they are prospective or retrospective and examples are provided.
This chapter discusses experimental research methodology. Some key points covered include:
1. Experimental research aims to establish cause-and-effect relationships by manipulating an independent variable and observing its effects on a dependent variable.
2. True experimental designs involve random assignment of subjects to treatment and control groups in order to control for extraneous variables.
3. Threats to internal validity like subject characteristics, mortality, instrumentation, history, and implementation must be evaluated and controlled for. Random assignment, pretesting, and use of control groups help address these threats.
4. Different types of experimental designs are discussed including randomized posttest-only, pretest-posttest, Solomon four-group, matching, counter
Experimental research design involves manipulating an independent variable and observing its effect on a dependent variable under controlled conditions. There are three main types of experimental designs: true experimental designs have complete control and random assignment; quasi-experimental designs lack random assignment; and pre-experimental designs have no control. True experiments consist of manipulation, control, and randomization. Common true experimental designs include post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs. Randomization helps reduce bias by giving all subjects an equal chance of being in the experimental or control group.
The document discusses sampling design and the two main types of sampling: probability sampling and non-probability sampling. Probability sampling involves random selection where every member of the population has a known chance of being selected. It is more complex but provides better representation. Non-probability sampling does not use random selection and there is no guarantee that the sample is representative. Specific sampling methods discussed include simple random sampling, systematic sampling, stratified sampling, cluster sampling, accidental sampling, purposive sampling, quota sampling, and judgmental sampling.
The importance of studying & comprehending the literature on a subject that is being taken up for research at every stage ranging from the topic selection, methodology or discussion of results is sought to be explained in this PPT. Intended target audience would be PG students onwards with some useful inputs for UG as well.
This presentation is for educational purpose only. I do not own the rights to written material or pictures or illustrations used.
This is being uploaded for students who are in search of, or trying to understand how a quasi-experimental research design should look like.
This document discusses quasi-experimental research design, which resembles a true experiment but lacks key components such as random assignment or a control group. Quasi-experiments involve manipulating an independent variable but do not have randomization or a control group. The three most popular quasi-experimental designs are: non-equivalent control group design, time series design, and multiple time series design. Quasi-experiments are used when true experiments are not feasible or ethical.
By the end of this presentation you should be able to:
Describe the justification of qualitative Sampling Techniques
Understand different types of Sampling Techniques
Simple slide show about research designs especially made for students working with Science Investigatory Projects. This also helpful for students who are first timer working with research.
Design of experiments is the most common Research design will wide reliability. It is mostly applicable in scientific lab type of research. This method is not applicable for descriptive research.
It involves both qualitative and quantitative data sets. The researchers can manipulate, control, replicate and randomize the experimental variables.
There are several types of experimental design depending on the selection of control, test and standard groups and their experimental setting.
The slides also show the guidelines regarding design of research proposal, Literature survey and important ethics in research. Guiding protocol to prepare a research and review article is also discussed.
This document discusses causal-comparative research, which studies cause-and-effect relationships between variables that are not manipulated by the researcher. It examines how causal-comparative research explores how independent variables influence dependent variables after the fact, without experimenter control. Some key points made are that this method is used when manipulation is impossible for ethical or practical reasons, and helps study problems that can't be replicated experimentally, though it is limited by a lack of control over variables.
Steps in Research-Types of research-Types of Steps in Research-Types of resea...AbhishikthSandeep1
This document discusses research methods and design. It defines research as a systematic, scientific investigation of a topic to discover new facts or test hypotheses. Research aims to contribute new knowledge through carefully defining problems, formulating hypotheses, collecting and analyzing data, reaching conclusions, and testing conclusions. The key objectives of research are exploratory, descriptive, diagnostic, and hypothesis testing. Characteristics of good research include being directed, empirical, carefully recorded and reported. The common steps in research are formulating the problem, reviewing literature, developing hypotheses, deciding design, collecting and analyzing data, testing hypotheses, and reporting conclusions.
This document discusses experimental research design. It defines experimental research as observations under controlled conditions where the researcher manipulates the independent variable. There are three main types of experimental designs: true experimental designs where the researcher has full control, quasi-experimental designs with less control, and pre-experimental designs with no control. True experimental designs involve random assignment, a control group, and manipulation of the independent variable. They allow for causal inferences about the effect of an intervention on the dependent variable. The document describes several true experimental designs including post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and cross-over designs.
This document discusses different types of experimental research designs. There are three main types of designs - pre-experimental, quasi-experimental, and true experimental. True experimental designs have the highest degree of control and involve manipulating the independent variable, using a control group, and random assignment to control for extraneous variables. Quasi-experimental designs manipulate the independent variable but lack either random assignment or a control group. Pre-experimental designs have the least control and do not use control groups or random assignment. Several examples of designs are provided within each category.
The document discusses research design and its key principles. It defines research design as a plan or blueprint for conducting a study that maximizes control over interfering factors and validity of findings. Some key points made:
- Research design refers to how a study will be conducted, the type of data collected, and means used to obtain the data.
- Reliability refers to consistency of data, while validity refers to accuracy and truth of measurements.
- Threats to validity include history, selection, testing, instrumentation, maturation, and mortality.
- Descriptive, experimental, and qualitative designs are three basic types of research design.
This document discusses quasi-experimental research designs. It defines quasi-experiments as resembling true experiments but lacking full control, such as random assignment. It describes various quasi-experimental designs including one group pre-test post-test, non-equivalent control group, interrupted time series, and time series with non-equivalent controls. Examples are provided of each design along with threats to validity. Common uses of quasi-experiments are discussed as well as advantages such as being able to be conducted in natural settings.
The document discusses grounded theory method and provides details on its key aspects:
- It defines grounded theory as a research method that generates or discovers a theory from data systematically obtained from social research.
- The main building blocks of grounded theory are discussed including coding, categories, concepts, theoretical sampling, constant comparison and memo writing.
- Strengths are that it effectively builds new theories and explains new phenomena, while weaknesses include the huge amount of time and data required for analysis.
This document defines and describes different types of experimental research designs. It discusses true experimental research, quasi-experimental research, pre-experimental research, and factorial designs. For each type of experimental research, it provides examples and discusses advantages and disadvantages. It also outlines several threats to validity that can occur in experimental research, such as history, maturation, testing, instrumentation, and more. Finally, it briefly discusses ex post facto research and provides a concluding remark on experimental research.
This document provides an overview of nonexperimental research design. It begins with definitions of nonexperimental research as research that observes phenomena as they naturally occur without introducing external variables or controlling settings. The document then discusses reasons for using nonexperimental design such as when variables cannot be ethically or practically manipulated. It also outlines various types of nonexperimental research design including surveys, Delphi surveys, correlation design, methodological studies, and comparative studies.
The document provides an overview of quantitative research methodology. It discusses key concepts including population, sampling, samples, and qualitative scales. Specifically, it defines population as any complete group with at least one characteristic in common. It explains that sampling is used to select a subset of a population for a study. The document also outlines different types of measurement scales in quantitative research including nominal, ordinal, interval, and ratio scales.
The document discusses different types of research designs, including explanatory trials which aim to study efficacy under ideal conditions, pragmatic trials which aim to study effectiveness in regular clinical practice, and cost benefit studies which aim to study efficiency in relation to resources consumed. It also discusses analytical studies, experimental trials using control groups, randomized controlled trials including group comparative and cross-over designs, non-randomized controlled trials, uncontrolled clinical trials, cohort studies, cross-sectional studies, and case control studies. The key aspects of each design such as whether they are prospective or retrospective and examples are provided.
This chapter discusses experimental research methodology. Some key points covered include:
1. Experimental research aims to establish cause-and-effect relationships by manipulating an independent variable and observing its effects on a dependent variable.
2. True experimental designs involve random assignment of subjects to treatment and control groups in order to control for extraneous variables.
3. Threats to internal validity like subject characteristics, mortality, instrumentation, history, and implementation must be evaluated and controlled for. Random assignment, pretesting, and use of control groups help address these threats.
4. Different types of experimental designs are discussed including randomized posttest-only, pretest-posttest, Solomon four-group, matching, counter
Experimental research design involves manipulating an independent variable and observing its effect on a dependent variable under controlled conditions. There are three main types of experimental designs: true experimental designs have complete control and random assignment; quasi-experimental designs lack random assignment; and pre-experimental designs have no control. True experiments consist of manipulation, control, and randomization. Common true experimental designs include post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs. Randomization helps reduce bias by giving all subjects an equal chance of being in the experimental or control group.
The document discusses sampling design and the two main types of sampling: probability sampling and non-probability sampling. Probability sampling involves random selection where every member of the population has a known chance of being selected. It is more complex but provides better representation. Non-probability sampling does not use random selection and there is no guarantee that the sample is representative. Specific sampling methods discussed include simple random sampling, systematic sampling, stratified sampling, cluster sampling, accidental sampling, purposive sampling, quota sampling, and judgmental sampling.
The importance of studying & comprehending the literature on a subject that is being taken up for research at every stage ranging from the topic selection, methodology or discussion of results is sought to be explained in this PPT. Intended target audience would be PG students onwards with some useful inputs for UG as well.
This presentation is for educational purpose only. I do not own the rights to written material or pictures or illustrations used.
This is being uploaded for students who are in search of, or trying to understand how a quasi-experimental research design should look like.
This document discusses quasi-experimental research design, which resembles a true experiment but lacks key components such as random assignment or a control group. Quasi-experiments involve manipulating an independent variable but do not have randomization or a control group. The three most popular quasi-experimental designs are: non-equivalent control group design, time series design, and multiple time series design. Quasi-experiments are used when true experiments are not feasible or ethical.
By the end of this presentation you should be able to:
Describe the justification of qualitative Sampling Techniques
Understand different types of Sampling Techniques
Simple slide show about research designs especially made for students working with Science Investigatory Projects. This also helpful for students who are first timer working with research.
Design of experiments is the most common Research design will wide reliability. It is mostly applicable in scientific lab type of research. This method is not applicable for descriptive research.
It involves both qualitative and quantitative data sets. The researchers can manipulate, control, replicate and randomize the experimental variables.
There are several types of experimental design depending on the selection of control, test and standard groups and their experimental setting.
The slides also show the guidelines regarding design of research proposal, Literature survey and important ethics in research. Guiding protocol to prepare a research and review article is also discussed.
This document discusses causal-comparative research, which studies cause-and-effect relationships between variables that are not manipulated by the researcher. It examines how causal-comparative research explores how independent variables influence dependent variables after the fact, without experimenter control. Some key points made are that this method is used when manipulation is impossible for ethical or practical reasons, and helps study problems that can't be replicated experimentally, though it is limited by a lack of control over variables.
Steps in Research-Types of research-Types of Steps in Research-Types of resea...AbhishikthSandeep1
This document discusses research methods and design. It defines research as a systematic, scientific investigation of a topic to discover new facts or test hypotheses. Research aims to contribute new knowledge through carefully defining problems, formulating hypotheses, collecting and analyzing data, reaching conclusions, and testing conclusions. The key objectives of research are exploratory, descriptive, diagnostic, and hypothesis testing. Characteristics of good research include being directed, empirical, carefully recorded and reported. The common steps in research are formulating the problem, reviewing literature, developing hypotheses, deciding design, collecting and analyzing data, testing hypotheses, and reporting conclusions.
This document discusses experimental research design. It defines experimental research as observations under controlled conditions where the researcher manipulates the independent variable. There are three main types of experimental designs: true experimental designs where the researcher has full control, quasi-experimental designs with less control, and pre-experimental designs with no control. True experimental designs involve random assignment, a control group, and manipulation of the independent variable. They allow for causal inferences about the effect of an intervention on the dependent variable. The document describes several true experimental designs including post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and cross-over designs.
This document discusses different types of experimental research designs. There are three main types of designs - pre-experimental, quasi-experimental, and true experimental. True experimental designs have the highest degree of control and involve manipulating the independent variable, using a control group, and random assignment to control for extraneous variables. Quasi-experimental designs manipulate the independent variable but lack either random assignment or a control group. Pre-experimental designs have the least control and do not use control groups or random assignment. Several examples of designs are provided within each category.
The document discusses various experimental research designs used in scientific studies. It describes true experimental designs which involve manipulation of an independent variable, control, and randomization. True experiments allow for causal inferences but have limitations in human studies. Quasi-experimental designs lack randomization or a control group. Pre-experimental designs have no control and are weak for establishing causality. Common designs discussed include pretest-posttest, Solomon four-group, randomized block, crossover, and time-series designs. Advantages and disadvantages of each type of design are provided.
Experimental research design aims to test hypotheses about causal relationships. It involves manipulating an independent variable and observing its effect on a dependent variable under controlled conditions. True experimental designs have three key characteristics - manipulation, control, and randomization. Manipulation means consciously controlling the independent variable. Control involves using a control group to account for extraneous variables. Randomization ensures subjects are randomly assigned to conditions. Common true experimental designs include post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs. While powerful for establishing causation, experimental designs also have limitations for studying humans.
Experimental research design aims to test hypotheses about causal relationships. It involves manipulating an independent variable and observing its effect on a dependent variable under controlled conditions. True experimental designs have three key features - manipulation, control, and randomization. Manipulation means consciously controlling the independent variable. Control involves using a control group to account for extraneous variables. Randomization ensures subjects are randomly assigned to conditions. Common true experimental designs include post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs. While powerful for establishing causation, experimental research also has limitations for studying humans.
This document discusses various experimental research designs, including pre-experimental, true experimental, and randomized controlled trial designs. It provides examples and descriptions of different types of designs, such as one-shot case design, one-group pretest-posttest design, post-test-only control design, pretest-post-test-only design, Solomon four-group design, factorial design, randomized block design, and crossover design. The goal is to help students understand how to properly structure experiments to minimize threats to validity and draw accurate conclusions about causal relationships between independent and dependent variables.
Experimental research designs aim to establish causal relationships by manipulating an independent variable and controlling other factors. True experimental designs use random assignment to control groups, with the experimental group receiving treatment and the control group not. Key true experimental designs include pre-test post-test control group design, post-test only control group design, Solomon four group design, factorial design, randomized block design, and crossover/repeated measures design. True experimental designs allow for strong conclusions but can be difficult to implement for human or natural setting studies due to ethical and practical challenges.
This document discusses various experimental research designs. It defines experimental research as research where the researcher manipulates variables and controls other factors to determine causal relationships. It describes several key experimental research designs: post-test only design, pre-test post-test design, Solomon four-group design, randomized block design, crossover design, and factorial design. For each design, it provides an example of how the design could be used to study a research question.
This document discusses various experimental research designs. It defines experimental research as research where the researcher manipulates variables and controls other factors to determine causal relationships. It describes several key experimental research designs: post-test only design, pre-test post-test design, Solomon four-group design, randomized block design, crossover design, and factorial design. For each design, it provides an example of how the design could be used to study a research question.
This document discusses research design and experimental research design. It defines key terms like independent variable, dependent variable, and extraneous variables. It explains the purpose of research design is to accurately assess relationships between variables. The three main characteristics of experimental research design are randomization, manipulation of the independent variable, and use of a control group. The document also categorizes and describes different types of true experimental research designs including post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs.
Quantitative approach, type, characteristics, advantagesPrincy Francis M
This document discusses quantitative research methods, including experimental, quasi-experimental, and non-experimental designs. It defines quantitative research as involving testing a theory by measuring variables numerically and analyzing results statistically. Experimental designs allow control and manipulation of variables but can be difficult to conduct on humans. Quasi-experimental and non-experimental designs are more practical but have less control. Non-experimental designs simply observe phenomena as they occur naturally.
This document discusses quasi-experimental research designs, which involve manipulating independent variables to observe their effects on dependent variables but lack random assignment of subjects to groups or a control group. It describes six types of quasi-experimental designs and their characteristics, advantages in being more practical than true experiments, and disadvantages of increased risk of bias versus experiments.
This document discusses experimental and quasi-experimental research designs. Experimental designs aim to establish causal relationships through manipulation of an independent variable and control of extraneous variables. True experiments use random assignment to conditions and a control group, while quasi-experiments lack one of these. Some key experimental designs are pre-test post-test, Solomon four-group, and factorial. Quasi-experiments are more feasible and include pre-post designs with or without control groups. Experimental research allows stronger conclusions about causality than other methods.
This document discusses experimental and quasi-experimental research designs. It defines experimental research as involving manipulation of an independent variable under controlled conditions to observe its effect on a dependent variable. True experimental designs involve random assignment, a control group, and manipulation. Quasi-experimental designs involve manipulation but lack either random assignment or a control group. Various true experimental designs like post-test only, pretest-posttest, and Solomon four-group designs are described. Quasi-experimental designs discussed include nonrandomized control group designs and time-series designs. Advantages and disadvantages of experimental designs are also presented.
This document discusses experimental research design. It begins by defining experimental research as observation under controlled conditions where the independent variable is manipulated through interventions. True experimental designs require manipulation of the independent variable, a control group, and random assignment of subjects. Several true experimental designs are described, including post-test only, pretest-post-test, Solomon four-group, factorial, and randomized block designs. Key aspects of each design like pretesting, treatment, and post-testing are explained through examples.
This document discusses quasi-experimental research design. Quasi-experimental research involves manipulating an independent variable to observe its effects, but unlike true experiments, it lacks random assignment or a control group. The two main types discussed are non-randomized control group design, where groups are not randomly assigned but a control receives no treatment, and time series design, where a treatment is applied and removed over multiple time periods to a small group. Quasi-experimental designs are more practical than true experiments when randomization is not possible but allow evaluation of treatment effects under natural conditions.
This document discusses research design. It begins by defining research design and outlining its purposes, which include providing a scheme to answer research questions, maintaining control to avoid bias, and organizing a study. The document then covers different categories of research design, including quantitative and qualitative approaches. It provides details on descriptive, correlational, experimental, and quasi-experimental designs. For each design, it discusses their characteristics, advantages, and disadvantages. The document emphasizes that research design establishes the framework and plan of action for a study.
Unlocking the Secrets to Safe Patient Handling.pdfLift Ability
Furthermore, the time constraints and workload in healthcare settings can make it challenging for caregivers to prioritise safe patient handling Australia practices, leading to shortcuts and increased risks.
KEY Points of Leicester travel clinic In London doc.docxNX Healthcare
In order to protect visitors' safety and wellbeing, Travel Clinic Leicester offers a wide range of travel-related health treatments, including individualized counseling and vaccines. Our team of medical experts specializes in getting people ready for international travel, with a particular emphasis on vaccines and health consultations to prevent travel-related illnesses. We provide a range of travel-related services, such as health concerns unique to a trip, prevention of malaria, and travel-related medical supplies. Our clinic is dedicated to providing top-notch care, keeping abreast of the most recent recommendations for vaccinations and travel health precautions. The goal of Travel Clinic Leicester is to keep you safe and well-rested no matter what kind of travel you choose—business, pleasure, or adventure.
This particular slides consist of- what is Pneumothorax,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is a summary of Pneumothorax:
Pneumothorax, also known as a collapsed lung, is a condition that occurs when air leaks into the space between the lung and chest wall. This air buildup puts pressure on the lung, preventing it from expanding fully when you breathe. A pneumothorax can cause a complete or partial collapse of the lung.
Rate Controlled Drug Delivery Systems, Activation Modulated Drug Delivery Systems, Mechanically activated, pH activated, Enzyme activated, Osmotic activated Drug Delivery Systems, Feedback regulated Drug Delivery Systems systems are discussed here.
The best massage spa Ajman is Chandrima Spa Ajman, which was founded in 2023 and is exclusively for men 24 hours a day. As of right now, our parent firm has been providing massage services to over 50,000+ clients in Ajman for the past 10 years. It has about 8+ branches. This demonstrates that Chandrima Spa Ajman is among the most reasonably priced spas in Ajman and the ideal place to unwind and rejuvenate. We provide a wide range of Spa massage treatments, including Indian, Pakistani, Kerala, Malayali, and body-to-body massages. Numerous massage techniques are available, including deep tissue, Swedish, Thai, Russian, and hot stone massages. Our massage therapists produce genuinely unique treatments that generate a revitalized sense of inner serenely by fusing modern techniques, the cleanest natural substances, and traditional holistic therapists.
Can coffee help me lose weight? Yes, 25,422 users in the USA use it for that ...nirahealhty
The South Beach Coffee Java Diet is a variation of the popular South Beach Diet, which was developed by cardiologist Dr. Arthur Agatston. The original South Beach Diet focuses on consuming lean proteins, healthy fats, and low-glycemic index carbohydrates. The South Beach Coffee Java Diet adds the element of coffee, specifically caffeine, to enhance weight loss and improve energy levels.
PET CT beginners Guide covers some of the underrepresented topics in PET CTMiadAlsulami
This lecture briefly covers some of the underrepresented topics in Molecular imaging with cases , such as:
- Primary pleural tumors and pleural metastases.
- Distinguishing between MPM and Talc Pleurodesis.
- Urological tumors.
- The role of FDG PET in NET.
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2. OUTLINES OF THE PRESENTATION
Introduction
Types of experimental research
designs
Essential principles of experimental
research design
Brief descriptions on true
experimental designs, Quasi and pre-
experimental research designs
Advantages and disadvantages
Conclusion
3.
4. Types of experimental research design
There are three primary types of experimental
design:
True experimental research design
Quasi-experimental research design
Pre-experimental research design
6. MANIPULATION
• Manipulation refers to conscious control
of the independent variable by the
researcher through treatment or
intervention to observe it’s effect on the
dependent variable.
EXAMPLE:
“EFFECTIVENESS OF BACK MASSAGE ON
SLEEP QUALITY AMONG CANCER
PATIENTS.”
7. CONTROL
• Control refers to the use of control group
and controlling the effects of extraneous
variables on the dependent variable in
which the researcher is interested.
Controlling Extraneous Variables by:
• Matching,
• counterbalancing,
• Homogeneity by statistical test.
8. MATCHING
• Is a conscious “matching" of the subject
characteristics in both the groups.
• It is a weak but a common method of
control over the extraneous variables.
• For example if age and gender are the
matching variables of interest in a two
group study
9. COUNTER BALANCING
• Counter balancing is another way to
exert control over extraneous variables.
• Counter balancing is used in which the
researcher is concerned that the order
and flow of intervention that influence
the treatment results.
10. HOMOGENEITY BY STATISTICAL
TEST
• To ensure homogeneity of the
demographic characteristics among
two groups under study, a chi-
square test may be applied on the
frequency distribution of selected
characteristics in two groups.
11. RANDOMIZATION
• Means that every subject has an equal
chance of being assigned to experimental
or control group.
• This is called random assignment of
subjects.
• The process involves random assignment
to different groups
12. • Through random assignment chances
of systemic bias is eliminated.
• Randomization is used in true
experimental designs to minimize the
threats of internal validity of the study
and eliminates the effects of
extraneous variables on the dependent
variables.
13. METHODS OF
RANDOMIZATION
• Tossing of coin:Random assignment
of study subjects may be done with
simple flip of a coin for each subject.
If coin lands on its “head”, subjects
are assigned to first group & with
“tail” the subjects are assigned to the
second group.
14. • Lottery method: Another methods is to
write the names of the subjects on slips
of paper and put the slips into a bowl
and then drew lots. The first designated
numbers of subjects are placed in one
group and the rest are assigned under
another group.
15. • A random table method: may be used to
facilitate the randomization process. In
this method blindfolds the subjects to
chose a number from a table of
numbers horizontally (row) or vertically
(column), till a requisite number is
reached for both the experimental &
control group.
Computer assisted random sequences
also may be used for the random
assignment of the subjects.
17. TRUE EXPERIMENTAL DESIGN
True experimental research relies on statistical analysis to prove
or disprove a hypothesis, making it the most accurate form of research. Of
the types of experimental design, only true design can establish a cause-
effect relationship within a group. In a true experiment, three factors
need to be satisfied:
There is a Control Group, which won’t be subject to changes, and
an Experimental Group, which will experience the changed
variables.
A variable which can be manipulated by the researcher
Random distribution
This experimental research method commonly carried out on
humanbeings (clinical trials, drug trial, testing of new medical or
surgical interventions) and on animals.
18.
19. POST TEST ONLY CONTROL DESIGN
• Is composed of two randomly assigned
group - experimental & control groups.
• Both the groups are not tested before to
the introduction of an intervention.
• While treatment is implemented on the
experimental group only, post test
observations are made on both the groups.
20. • This design is helpful in situations where
it is not possible to pre test the
participants.
• E.g., Efficacy of pulmonary
rehabilitation on quality of life in
COPD PATIENTS.
21. POST TEST ONLY CONTROL DESIGN
RANDOM
ASSIGNMENT
EXP GROUP
CONTROL
GRP
TREATMENT POST TEST
POST TEST
22. PRETEST-POST-TEST-ONLY DEIGN
• In this design, subjects are randomly
assigned to either the experimental
or control group.
• The effect of the dependent variable
on both the groups is seen before
the treatment (pre test).
23. • Following this the treatment is
carried out on experimental group
only. After treatment observation of
dependent variable is made on both the
groups to examine the effect of the
manipulation of independent variable on
dependent variable.
• EXAMPLE :EFFECTIVENESS OF
COUNSELLING THERAPY ON
DEPRESSION AMONG THE CANCER
PATIENTS
24. PRETEST –POST TEST ONLY DESIGN
RANDOM
ASSIGNMENT
EXP GROUP
CONTROL
GRP
TREATMENT
POST TEST
POST TEST
PRE
TEST
PRE
TEST
25. SOLOMON FOUR GROUP DESIGN
RANDOM
ASSIGNMENT
Exp grp I
Exp grp II
Cont grp I
Cont grp II
Pre test
Pre test
Treatment
Treatment
Post
test
Post
test
Post
test
Post
test
27. • EXAMPLE:
EEFFECTIVENESS OF SELF-INSTRUCTIONAL
MODULE ON KNOWLEDGE OF CARE OF
ACUTE RESPIRATORY INFECTION AMONG
MOTHERS UNDER FIVE CHILDREN
The disadvantage of this design is that
it requires a large sample and statistical
analysis, and therefore not commonly used
in health care researches.
28. FACTORIAL DESIGN
• Here the researchers wants to test
effectiveness of two or more
independent variables at different
levels in a single study.
• in this the effect of independent
variables is combined with another
independent variables and the
possible effects on dependent
variable based on time periods are
produced.
29. • E.g., researcher wants to test the
efficacy of two different medication.
• The design facilitates the testing of
several hypotheses at a single time.
• Typically factorial design incorporates
2x2 or 2x3 factorial. (it can be any
combination)
30. FACTORIAL DESIGN
FREQUENCY OF
TREATMENT
PROTOCOLS OF
TREATMENT
PROTOCOLS OF
TREATMENT
ALPHA (I)
(DRUG I)
BETA (II)
(DRUG II)
4 hourly (B1) A1 B1 A2 B1
6 hourly (B2) A1 B2 A2 B2
8 hourly (B3) A1 B3 A2 B3
32. RANDOMIZED BLOCK DESIGN
• Randomized block design is used when
the researcher desires to bring
homogeneity among selected groups.
• This is a simple method to reduce the
variability among the treatment groups
by a more homogenous combination of
the subjects through randomized block
design.
33. • For example if the researcher wants to test
the efficacy of three different medications
in reducing hypertension, to ensure
homogeneity among subjects under
treatment, researcher randomly places the
subjects in homogenous groups (blocks).
• like patients with hypertension, diabetic
patients with hypertension and
hypertensive patients with heart diseases.
34. The design looks similar to that of
factorial design in structure, but out
of two factors one factor is not
experimentally manipulated.
35. RANDOMIZED BLOCK DESIGN
TYPE OF
HYPERTENSIVE
DRUG
BLOCKS BLOCKS BLOCKS
PATIENT WITH
HYPERTENSION
(I)
DIABETIC
PATIENT WITH
HYPERTENSION
(II)
PATIENT WITH
HEART DISEASE
AND
HYPERTENSION
(III)
A A,1 A, I A, III
B B,1 B, I B, II
C C,1 C, I C, III
36. CROSS OVER DESIGN
• In cross over design the study
subjects are exposed to more than
one treatment.
• It is also known as “repeat measure
design”.
• The participants himself acts as their
own control
37. • This design is more efficient in establishing
the highest possible similarity among
subjects exposed to different conditions
where groups compared obviously have
equal distribution of characteristics.
• Some times this design is not effective
because, when subjects are exposed to two
different conditions, their responses of the
second condition may be influenced by
their experience in the first condition.
38. CROSS OVER DESIGN
GROUPS TREATMENT
PROTOCOL
TREATMENT
PROTOCOL
GROUP I TREATMENT I TREATMENT II
GROUP II TREATMENT II TREATMENT I
39. ADVANTAGES OF TRUE
EXPERIMENTAL DESIGN
• Most powerful design to establish the
causal relationship between
independent and dependent variable.
• Since the study is conducted under
controlled environment, it can yield a
greater degree of purity in observation.
40. • Conditions that are not found in natural
setting can be created in experimental
setting in a short period of time that may
take years to naturally occur (therefore
very useful in genetic studies).
• Because the experiment is carried out in
experimental setting the problems of
real life situations and the personal
problems of the researcher is eliminated.
41. DISADVANTAGES OF TRUE
EXPERIMENTAL DESIGN
• Most often the results of experimental
designs cannot be replicated in studies
conducted on humans due to ethical
problems.
• Many of the human variables neither
have valid measurable criteria nor
instruments to measure them.
42. • In experimental studies conducted in
natural settings like a hospital or
community, it is not possible to impose
control over extraneous variables.
• Experiments are often more impractical
when the effect of independent variable
may require a lengthy period of time
before it can emerge as a response on
the criterion measures.
43. • It is very difficult to obtain permission from the
participants.
• Because the size of the sample is kept small
especially studies involving humans, the
representativeness of the findings of such study
is questionable.
• Though theoretically experimental designs can
yields a greater insights , yet practically many a
times they are not possible in human studies as
humans & their parameters are complex.
44. OTHERS EXPERIMENTAL DESIGNS(RANDOMIZED
CONTROL TRIALS IN NURSING
steps of clinical trial
Decision
Randomization
Implement
experimental
& control
intervention
Stating research
question&hypo
thesis
Enrolling
participants
Blinding
Defining
population
Listing
inclusion&exclus
ion criteria
Measurement
of protocols
Sample size
determination
Assessment of
outcomes and
analysis
Reporting
45. TYPES OF RCT
BASED ON OUTCOME
BASED ON STUDY
DESIGNS
CLINICAL TRIAL
PREVENTIVE TRIALS
RISK FACTORS
CESSATION TRIAL
EVALUATION TRIAL
PARALLEL
GR.DESIGN
CROSS OVER
DESIGN
FACTORIAL DESIGN
46. QUASI – EXPERIMENTAL RESEARCH DESIGN
The word “Quasi” indicates similarity. A quasi-
experimental design is similar to experimental, but it is
not the same. The difference between the two is the
assignment of a control group. In other words, quasi-
experimental designs have an element of
manipulation but lack at least one of the other two
properties that characterize true experiments;
randomization or a control group.
48. NONRANDOMIZED CONTROL GROUP DESIGN
It is also known as the ‘nonequivalent control group design’.
This design is identical to the pretest-posttest control group
design, except there is no random assignment of subjects in
experimental & control groups.
50. For example, this method was used to study ‘the
effects of integrated care on quality of work in
nursing homes: a quasi- experiment’.
The purpose of this study was to examine the
implementation of integrated care in the nursing
home sector, & its effect on the quality of work of the
caregivers.
A nonequivalent pretest-posttest control group
design was used in this study.
Data was collected by through a questionnaire.
CONT...
51. TIME-SERIES DESIGN
This design is useful when the experimenter
wants to measure the effects of a treatment
over a long period of time.
The experimenter would continue to
administer the treatment & measure the
effects a number of times during the course
of the experiment.
52. CONT..
Generally it is a single-subject research, in which
the researcher carries out an experiment on an
individual or on a small number of individuals, by
alternating between administering & then
withdrawing the treatment to determine the
effectiveness of the intervention.
Exp.
group O1 O3
O2 O3
O2
O1
Treatment
53. CONT…
A researcher might assess pain levels of a group of
patients with low-back pain. After 3 weeks of pain
assessment, subjects are taught special exercises to
reduce that pain. During the next 3 weeks, pain levels
would again be measured.
Measuring a child’s school performance on a weekly basis,
& then introducing a new teaching technique. Then again
measuring on a weekly basis.
54. ADVANTAGES OF QUASI-EXPERIMENTAL DESIGN
Quasi-experimental designs are more frequently used because they are
more practical & feasible to conduct research studies in nursing, where
in the absence of a large sample size, randomization &/ or availability of
control groups are not always possible.
This design is more suitable for real-world natural setting than true
experimental research designs.
It allows researchers to evaluate the impact of quasi- independent
variables under naturally occurring conditions.
It may be able to establishing casual relationship. Wherein some of the
hypotheses are practically answered through this design only.
55. DISADVANTAGES OF
QUASI-EXPERIMENTAL DESIGN
There is no control over extraneous
variables influencing the dependant
variables.
The absence of a control group or lack of control
over the research setting makes the results of this
design less reliable & weak for the establishment
of casual relationship between independent &
dependant variables.
56. PRE-EXPERIMENT
AL RESEARCH DESIGN
Pre-Experimental Designs are the simplest form
of research design. In a pre-experiment either a
single group or multiple groups are observed
subsequent to some agent or treatment
presumed to cause change. Very weak design