Training on
Research Methodology-Part 1
Mohammad Reza Ahmed Khan
Deputy Director
“If I have seen further, it is by standing on the shoulders of giants.” - Sir Isaac Newton
Department of Agricultural Marketing (DAM)
Table of Contents
• Research process
• Research Methods
• Research Design
• Research Tools & Techniques
Research Process
Step 1. Identify the Research Topic
Step 2. Review Existing Research
Step 3. Design the Research Methodology
Step 4. Select the Sample and Participants
Step 5. Information Collection
Step 6. Data Analysis
Step 3. Design the Research Methodology
Step 7. Interpretation of Results
Step 8. Draw Conclusions
Step 10. Make Recommendations
Step 11. Write the Research Report
Step 12. Peer Review and Revision
Research Process
Step 1. Identify the Research Topic
Choose a research topic that interests you and aligns with your expertise and
resources. Develop clear and focused research questions that you want to answer
through your study.
Step 2. Review Existing Research
Conduct a thorough literature review to identify what research has already been done
on your chosen topic. This will help you understand the current state of knowledge,
identify gaps in the literature, and refine your research questions.
Step 3. Design the Research Methodology
Determine the appropriate research methodology that suits your research questions.
Decide whether your study will be qualitative, quantitative, or a mix of both (mixed
methods). Also, choose the data collection methods, such as surveys, interviews,
experiments, observations, etc.
Step 4. Select the Sample and Participants
If your study involves human participants, decide on the sample size and selection
criteria. Obtain ethical approval, if required, and ensure that participants’ rights and
privacy are protected throughout the research process.
Research Process
Step 5. Information Collection
Collect information and data based on your chosen research methodology.
Qualitative research has more intellectual information, while quantitative research results
are more data-oriented. Ensure that your data collection process is standardized and
consistent to maintain the validity of the results.
Step 6. Data Analysis
Analyze the data you have collected using appropriate statistical or
qualitative research methods. The type of analysis will depend on the nature of your data
and research questions.
Step 7. Interpretation of Results
Interpret the findings of your data analysis. Relate the results to your research questions and
consider how they contribute to the existing knowledge in the field.
Step 8. Draw Conclusions
Based on your interpretation of the results, draw meaningful conclusions that answer your
research questions. Discuss the implications of your findings and how they align with the
existing literature.
Step 9. Discuss Limitations
Acknowledge and discuss any limitations of your study. Addressing limitations demonstrates
the validity and reliability of your research.
Step 10. Make Recommendations
If applicable, provide recommendations based on your research findings. These
recommendations can be for future research, policy changes, or practical
applications.
Step 11. Write the Research Report
Prepare a comprehensive research report detailing all aspects of your study,
including the introduction, methodology, results, discussion, conclusion, and
references.
Step 12. Peer Review and Revision
If you intend to publish your research, submit your report to peer-reviewed
journals. Revise your research report based on the feedback received from
reviewers.
Make sure to share your research findings with the broader community through
conferences, seminars, or other appropriate channels, this will help contribute to
the collective knowledge in your field of study. Remember that conducting research
is a dynamic process, and you may need to revisit and refine various steps as you
progress
Research Process
Research Methods
Type of Study suitable for your
Research Problem
Step 3. Design the Research Methodology
1. Quantitative Research: Unlocking the Power of Numbers
Quantitative research is centered around collecting numerical data and employing
statistical techniques to draw conclusions. This type of research is often used to
measure variables, identify patterns, and establish causal relationships.
Surveys:
Purpose: Surveys are utilized to collect data from a large audience to identify
trends and generalize findings.
Method: Employ structured questionnaires with closed-ended questions.
Example: Businesses conduct customer satisfaction surveys to understand
consumer preferences and make informed decisions.
Experiments:
Purpose: Experiments are designed to test hypotheses by manipulating
variables in a controlled setting.
Method: Use experimental and control groups to establish cause-and-effect
relationships.
Example: In scientific research, experiments are conducted to evaluate the
effectiveness of a new drug treatment.
Research Methods
• Observational Studies:
– Purpose: Observational studies involve watching and recording subjects
without interference, providing insights into natural behaviors.
– Method: Systematically observe and document phenomena.
– Example: Wildlife researchers use observational studies to study animal
behaviors in their natural habitats.
• Secondary Data Analysis:
– Purpose: Re-analyze existing datasets to extract new insights, saving time
and resources.
– Method: Utilize pre-existing data from sources such as government
databases or academic publications.
– Example: Economists analyze census data to examine employment
trends and economic growth.
Research Methods
2. Qualitative Research: Exploring the Depths of Human Experience
Qualitative research focuses on understanding the intricacies of human experiences,
beliefs, and social phenomena. It provides rich, in-depth insights and interpretations
that numbers alone cannot capture.
• Interviews:
– Purpose: Conduct in-depth interviews to explore individual perspectives and
gain insights into complex topics.
– Method: Use semi-structured or unstructured interviews to allow participants
to share their thoughts freely.
– Example: Healthcare researchers interview patients to understand their
experiences and emotional responses to treatments.
• Focus Groups:
– Purpose: Gather diverse opinions and insights from group discussions on
specific topics.
– Method: Facilitate guided conversations with selected participants.
– Example: Marketing teams conduct focus groups to test new product concepts
and gather feedback.
Research Methods
• Ethnography:
• Purpose: Immerse in a culture or community to understand their
practices, values, and social dynamics.
• Method: Engage in long-term observation and interaction within the
community.
• Example: Anthropologists conduct ethnographic research to study
cultural rituals and traditions.
• Case Studies:
• Purpose: Provide an in-depth examination of a single subject, event, or
organization to uncover insights and identify patterns.
• Method: Use multiple data sources to gain comprehensive knowledge.
• Example: Business analysts study successful startups to identify
strategies for growth and innovation.
Research Methods
3. Mixed-Methods Research: Bridging the Gap
Mixed-methods research combines qualitative and quantitative approaches to gain a deeper
insight into complex problems. This integration allows researchers to benefit from both numerical
data and narrative insights.
• Purpose: Leverage the strengths of both quantitative and qualitative data.
• Method: Employ a combination of surveys, interviews, and other techniques.
• Example: Educational researchers use mixed methods to evaluate student performance
through test scores and personal interviews.
4. Cross-Sectional Studies: Snapshot of a Moment
Cross-sectional studies analyze data from a population at a specific point in time to identify
patterns, correlations, or differences between variables.
• Purpose: Provide a snapshot of a population’s characteristics and relationships.
• Method: Collect data simultaneously from multiple subjects.
• Example: Public health researchers conduct cross-sectional studies to assess disease
prevalence in a community.
Research Methods
5. Longitudinal Studies: Observing Change Over Time
Longitudinal studies track the same subjects over an extended period, providing valuable
insights into changes, trends, and long-term effects.
• Purpose: Examine changes and developments over time.
• Method: Collect data from the same participants at multiple intervals.
• Example: Psychologists conduct longitudinal studies to understand cognitive
development from childhood to adulthood.
6. Action Research: Solving Real-World Problems
Action research involves collaboration with stakeholders to identify and address practical
issues, aiming for immediate impact and improvement.
• Purpose: Implement solutions and drive change in real-world settings.
• Method: Engage participants actively in the research process.
• Example: Educators conduct action research to enhance teaching methods and
student engagement.
Research Methods
7. Case-Control Studies: Uncovering Causes and Risks
Case-control studies compare individuals with a particular outcome (cases)
to those without it (controls) to identify potential causes or risk factors.
• Purpose: Identify factors linked to specific outcomes or diseases.
• Method: Analyze historical data between cases and controls.
• Example: Epidemiologists conduct case-control studies to investigate
potential causes of rare diseases.
8. Descriptive Research: Painting a Picture
Descriptive research aims to provide detailed descriptions and summaries
of phenomena without manipulating variables, offering a clear picture of a
subject.
• Purpose: Describe characteristics, behaviors, or patterns.
• Method: Use surveys, observations, or case studies.
• Example: Sociologists use descriptive research to document urban
population demographics.
Research Methods
9. Correlational Research: Understanding Relationships
Correlational research examines the relationship between
two or more variables to identify patterns, associations,
or correlations without inferring causation.
• Purpose: Identify patterns and associations between
variables.
• Method: Use statistical analysis to determine
correlation coefficients.
• Example: Researchers study the correlation between
physical activity levels and mental well-being.
Research Methods
10. Grounded Theory: Building Theories from Data
Grounded theory is an approach where theories are
developed based on systematically gathered and analyzed
data, allowing concepts and frameworks to emerge
organically.
• Purpose: Develop theories grounded in empirical evidence.
• Method: Use iterative data collection and analysis.
• Example: Social scientists build theories on workplace
motivation through employee interviews and observations.
Research Methods
11. Meta-Analysis: Synthesizing Evidence
Meta-analysis is a powerful statistical technique that combines
the results of multiple studies on a similar topic to draw robust
conclusions and insights.
• Purpose: Synthesize existing research findings for stronger
conclusions.
• Method: Aggregate and analyze data from numerous studies.
• Example: Medical researchers perform meta-analysis to assess
the overall effectiveness of treatment across multiple clinical
trials.
Research Methods
Research Design
Research Design
Key elements of research design include:
• Research Objectives: Clearly define the goals and objectives of the research study. What is the
research trying to achieve or investigate?
• Research Questions or Hypotheses: Formulating specific research questions or hypotheses that
address the objectives of the study. These questions guide the research process.
• Data Collection Methods: Determining how data will be collected, whether through surveys,
experiments, observations, interviews, archival research, or a combination of these methods.
• Sampling: Deciding on the target population and selecting a sample that represents that population.
Sampling methods can vary, such as random sampling, stratified sampling, or convenience sampling.
• Data Collection Instruments: Developing or selecting the tools and instruments needed to collect
data, such as questionnaires, surveys, or experimental equipment.
• Data Analysis: Defining the statistical or analytical techniques that will be used to analyze the collected
data. This may involve qualitative or quantitative methods, depending on the research goals.
• Time Frame: Establishing a timeline for the research project, including when data will be collected,
analyzed, and reported.
• Ethical Considerations: Addressing ethical issues, including obtaining informed consent from
participants, ensuring the privacy and confidentiality of data, and adhering to ethical guidelines.
• Resources: Identifying the resources needed for the research, including funding, personnel,
equipment, and access to data sources.
• Data Presentation and Reporting: Planning how the research findings will be presented and reported,
whether through written reports, presentations, or other formats.
Experimental Design: A pharmaceutical
company conducts a randomized
controlled trial (RCT) to test the efficacy
of a new drug. Participants are
randomly assigned to two groups: one
receiving the new drug and the other a
placebo. The company measures the
health outcomes of both groups over a
specific period.
Observational Design: An ecologist
observes the behavior of a particular
bird species in its natural habitat to
understand its feeding patterns, mating
rituals, and migration habits.
Survey Design: A market research firm
conducts a survey to gather data on
consumer preferences for a new
product. They distribute a
questionnaire to a representative
sample of the target population and
analyze the responses.
Research Design Examples
• Case Study Design: A psychologist conducts a case study on an individual with a
rare psychological disorder to gain insights into the causes, symptoms, and
potential treatments of the condition.
• Content Analysis: Researchers analyze a large dataset of social media posts to
identify trends in public opinion and sentiment during a political election
campaign.
• Historical Research: A historian examines primary sources such as letters,
diaries, and official documents to reconstruct the events and circumstances
leading up to a significant historical event.
• Action Research: A school teacher collaborates with colleagues to implement a
new teaching method in their classrooms and assess its impact on student
learning outcomes through continuous reflection and adjustment.
• Ethnographic Research: An anthropologist lives with and observes an
indigenous community for an extended period to understand their culture,
social structures, and daily lives.
• Cross-Sectional Survey: A public health agency conducts a cross-sectional
survey to assess the prevalence of smoking among different age groups in a
specific region during a particular year.
• Longitudinal Study: A developmental psychologist follows a group of children
from infancy through adolescence to study their cognitive, emotional, and
social development over time.
• Meta-Analysis: Researchers aggregate and analyze the results of multiple
studies on the effectiveness of a specific type of therapy to provide a
comprehensive overview of its outcomes.
• Mixed-Methods Research: A sociologist combines surveys and in-depth
interviews to study the impact of a community development program on
residents’ quality of life.
• Grounded Theory: A sociologist conducts interviews with homeless individuals
to develop a theory explaining the factors that contribute to homelessness and
the strategies they use to cope.
• Simulation and Modeling: Climate scientists use computer models to simulate
the effects of various greenhouse gas emission scenarios on global
temperatures and sea levels.
• Case-Control Study: Epidemiologists investigate a disease outbreak by
comparing a group of individuals who contracted the disease (cases) with a
group of individuals who did not (controls) to identify potential risk factors.
Research Design Examples
Thank You
Q & A

Basics of Research Methodology Part1.pptx

  • 1.
    Training on Research Methodology-Part1 Mohammad Reza Ahmed Khan Deputy Director “If I have seen further, it is by standing on the shoulders of giants.” - Sir Isaac Newton Department of Agricultural Marketing (DAM)
  • 2.
    Table of Contents •Research process • Research Methods • Research Design • Research Tools & Techniques
  • 3.
    Research Process Step 1.Identify the Research Topic Step 2. Review Existing Research Step 3. Design the Research Methodology Step 4. Select the Sample and Participants Step 5. Information Collection Step 6. Data Analysis Step 3. Design the Research Methodology Step 7. Interpretation of Results Step 8. Draw Conclusions Step 10. Make Recommendations Step 11. Write the Research Report Step 12. Peer Review and Revision
  • 4.
    Research Process Step 1.Identify the Research Topic Choose a research topic that interests you and aligns with your expertise and resources. Develop clear and focused research questions that you want to answer through your study. Step 2. Review Existing Research Conduct a thorough literature review to identify what research has already been done on your chosen topic. This will help you understand the current state of knowledge, identify gaps in the literature, and refine your research questions. Step 3. Design the Research Methodology Determine the appropriate research methodology that suits your research questions. Decide whether your study will be qualitative, quantitative, or a mix of both (mixed methods). Also, choose the data collection methods, such as surveys, interviews, experiments, observations, etc. Step 4. Select the Sample and Participants If your study involves human participants, decide on the sample size and selection criteria. Obtain ethical approval, if required, and ensure that participants’ rights and privacy are protected throughout the research process.
  • 5.
    Research Process Step 5.Information Collection Collect information and data based on your chosen research methodology. Qualitative research has more intellectual information, while quantitative research results are more data-oriented. Ensure that your data collection process is standardized and consistent to maintain the validity of the results. Step 6. Data Analysis Analyze the data you have collected using appropriate statistical or qualitative research methods. The type of analysis will depend on the nature of your data and research questions. Step 7. Interpretation of Results Interpret the findings of your data analysis. Relate the results to your research questions and consider how they contribute to the existing knowledge in the field. Step 8. Draw Conclusions Based on your interpretation of the results, draw meaningful conclusions that answer your research questions. Discuss the implications of your findings and how they align with the existing literature. Step 9. Discuss Limitations Acknowledge and discuss any limitations of your study. Addressing limitations demonstrates the validity and reliability of your research.
  • 6.
    Step 10. MakeRecommendations If applicable, provide recommendations based on your research findings. These recommendations can be for future research, policy changes, or practical applications. Step 11. Write the Research Report Prepare a comprehensive research report detailing all aspects of your study, including the introduction, methodology, results, discussion, conclusion, and references. Step 12. Peer Review and Revision If you intend to publish your research, submit your report to peer-reviewed journals. Revise your research report based on the feedback received from reviewers. Make sure to share your research findings with the broader community through conferences, seminars, or other appropriate channels, this will help contribute to the collective knowledge in your field of study. Remember that conducting research is a dynamic process, and you may need to revisit and refine various steps as you progress Research Process
  • 7.
    Research Methods Type ofStudy suitable for your Research Problem Step 3. Design the Research Methodology
  • 8.
    1. Quantitative Research:Unlocking the Power of Numbers Quantitative research is centered around collecting numerical data and employing statistical techniques to draw conclusions. This type of research is often used to measure variables, identify patterns, and establish causal relationships. Surveys: Purpose: Surveys are utilized to collect data from a large audience to identify trends and generalize findings. Method: Employ structured questionnaires with closed-ended questions. Example: Businesses conduct customer satisfaction surveys to understand consumer preferences and make informed decisions. Experiments: Purpose: Experiments are designed to test hypotheses by manipulating variables in a controlled setting. Method: Use experimental and control groups to establish cause-and-effect relationships. Example: In scientific research, experiments are conducted to evaluate the effectiveness of a new drug treatment. Research Methods
  • 9.
    • Observational Studies: –Purpose: Observational studies involve watching and recording subjects without interference, providing insights into natural behaviors. – Method: Systematically observe and document phenomena. – Example: Wildlife researchers use observational studies to study animal behaviors in their natural habitats. • Secondary Data Analysis: – Purpose: Re-analyze existing datasets to extract new insights, saving time and resources. – Method: Utilize pre-existing data from sources such as government databases or academic publications. – Example: Economists analyze census data to examine employment trends and economic growth. Research Methods
  • 10.
    2. Qualitative Research:Exploring the Depths of Human Experience Qualitative research focuses on understanding the intricacies of human experiences, beliefs, and social phenomena. It provides rich, in-depth insights and interpretations that numbers alone cannot capture. • Interviews: – Purpose: Conduct in-depth interviews to explore individual perspectives and gain insights into complex topics. – Method: Use semi-structured or unstructured interviews to allow participants to share their thoughts freely. – Example: Healthcare researchers interview patients to understand their experiences and emotional responses to treatments. • Focus Groups: – Purpose: Gather diverse opinions and insights from group discussions on specific topics. – Method: Facilitate guided conversations with selected participants. – Example: Marketing teams conduct focus groups to test new product concepts and gather feedback. Research Methods
  • 11.
    • Ethnography: • Purpose:Immerse in a culture or community to understand their practices, values, and social dynamics. • Method: Engage in long-term observation and interaction within the community. • Example: Anthropologists conduct ethnographic research to study cultural rituals and traditions. • Case Studies: • Purpose: Provide an in-depth examination of a single subject, event, or organization to uncover insights and identify patterns. • Method: Use multiple data sources to gain comprehensive knowledge. • Example: Business analysts study successful startups to identify strategies for growth and innovation. Research Methods
  • 12.
    3. Mixed-Methods Research:Bridging the Gap Mixed-methods research combines qualitative and quantitative approaches to gain a deeper insight into complex problems. This integration allows researchers to benefit from both numerical data and narrative insights. • Purpose: Leverage the strengths of both quantitative and qualitative data. • Method: Employ a combination of surveys, interviews, and other techniques. • Example: Educational researchers use mixed methods to evaluate student performance through test scores and personal interviews. 4. Cross-Sectional Studies: Snapshot of a Moment Cross-sectional studies analyze data from a population at a specific point in time to identify patterns, correlations, or differences between variables. • Purpose: Provide a snapshot of a population’s characteristics and relationships. • Method: Collect data simultaneously from multiple subjects. • Example: Public health researchers conduct cross-sectional studies to assess disease prevalence in a community. Research Methods
  • 13.
    5. Longitudinal Studies:Observing Change Over Time Longitudinal studies track the same subjects over an extended period, providing valuable insights into changes, trends, and long-term effects. • Purpose: Examine changes and developments over time. • Method: Collect data from the same participants at multiple intervals. • Example: Psychologists conduct longitudinal studies to understand cognitive development from childhood to adulthood. 6. Action Research: Solving Real-World Problems Action research involves collaboration with stakeholders to identify and address practical issues, aiming for immediate impact and improvement. • Purpose: Implement solutions and drive change in real-world settings. • Method: Engage participants actively in the research process. • Example: Educators conduct action research to enhance teaching methods and student engagement. Research Methods
  • 14.
    7. Case-Control Studies:Uncovering Causes and Risks Case-control studies compare individuals with a particular outcome (cases) to those without it (controls) to identify potential causes or risk factors. • Purpose: Identify factors linked to specific outcomes or diseases. • Method: Analyze historical data between cases and controls. • Example: Epidemiologists conduct case-control studies to investigate potential causes of rare diseases. 8. Descriptive Research: Painting a Picture Descriptive research aims to provide detailed descriptions and summaries of phenomena without manipulating variables, offering a clear picture of a subject. • Purpose: Describe characteristics, behaviors, or patterns. • Method: Use surveys, observations, or case studies. • Example: Sociologists use descriptive research to document urban population demographics. Research Methods
  • 15.
    9. Correlational Research:Understanding Relationships Correlational research examines the relationship between two or more variables to identify patterns, associations, or correlations without inferring causation. • Purpose: Identify patterns and associations between variables. • Method: Use statistical analysis to determine correlation coefficients. • Example: Researchers study the correlation between physical activity levels and mental well-being. Research Methods
  • 16.
    10. Grounded Theory:Building Theories from Data Grounded theory is an approach where theories are developed based on systematically gathered and analyzed data, allowing concepts and frameworks to emerge organically. • Purpose: Develop theories grounded in empirical evidence. • Method: Use iterative data collection and analysis. • Example: Social scientists build theories on workplace motivation through employee interviews and observations. Research Methods
  • 17.
    11. Meta-Analysis: SynthesizingEvidence Meta-analysis is a powerful statistical technique that combines the results of multiple studies on a similar topic to draw robust conclusions and insights. • Purpose: Synthesize existing research findings for stronger conclusions. • Method: Aggregate and analyze data from numerous studies. • Example: Medical researchers perform meta-analysis to assess the overall effectiveness of treatment across multiple clinical trials. Research Methods
  • 18.
  • 19.
    Research Design Key elementsof research design include: • Research Objectives: Clearly define the goals and objectives of the research study. What is the research trying to achieve or investigate? • Research Questions or Hypotheses: Formulating specific research questions or hypotheses that address the objectives of the study. These questions guide the research process. • Data Collection Methods: Determining how data will be collected, whether through surveys, experiments, observations, interviews, archival research, or a combination of these methods. • Sampling: Deciding on the target population and selecting a sample that represents that population. Sampling methods can vary, such as random sampling, stratified sampling, or convenience sampling. • Data Collection Instruments: Developing or selecting the tools and instruments needed to collect data, such as questionnaires, surveys, or experimental equipment. • Data Analysis: Defining the statistical or analytical techniques that will be used to analyze the collected data. This may involve qualitative or quantitative methods, depending on the research goals. • Time Frame: Establishing a timeline for the research project, including when data will be collected, analyzed, and reported. • Ethical Considerations: Addressing ethical issues, including obtaining informed consent from participants, ensuring the privacy and confidentiality of data, and adhering to ethical guidelines. • Resources: Identifying the resources needed for the research, including funding, personnel, equipment, and access to data sources. • Data Presentation and Reporting: Planning how the research findings will be presented and reported, whether through written reports, presentations, or other formats.
  • 20.
    Experimental Design: Apharmaceutical company conducts a randomized controlled trial (RCT) to test the efficacy of a new drug. Participants are randomly assigned to two groups: one receiving the new drug and the other a placebo. The company measures the health outcomes of both groups over a specific period. Observational Design: An ecologist observes the behavior of a particular bird species in its natural habitat to understand its feeding patterns, mating rituals, and migration habits. Survey Design: A market research firm conducts a survey to gather data on consumer preferences for a new product. They distribute a questionnaire to a representative sample of the target population and analyze the responses.
  • 21.
    Research Design Examples •Case Study Design: A psychologist conducts a case study on an individual with a rare psychological disorder to gain insights into the causes, symptoms, and potential treatments of the condition. • Content Analysis: Researchers analyze a large dataset of social media posts to identify trends in public opinion and sentiment during a political election campaign. • Historical Research: A historian examines primary sources such as letters, diaries, and official documents to reconstruct the events and circumstances leading up to a significant historical event. • Action Research: A school teacher collaborates with colleagues to implement a new teaching method in their classrooms and assess its impact on student learning outcomes through continuous reflection and adjustment. • Ethnographic Research: An anthropologist lives with and observes an indigenous community for an extended period to understand their culture, social structures, and daily lives. • Cross-Sectional Survey: A public health agency conducts a cross-sectional survey to assess the prevalence of smoking among different age groups in a specific region during a particular year.
  • 22.
    • Longitudinal Study:A developmental psychologist follows a group of children from infancy through adolescence to study their cognitive, emotional, and social development over time. • Meta-Analysis: Researchers aggregate and analyze the results of multiple studies on the effectiveness of a specific type of therapy to provide a comprehensive overview of its outcomes. • Mixed-Methods Research: A sociologist combines surveys and in-depth interviews to study the impact of a community development program on residents’ quality of life. • Grounded Theory: A sociologist conducts interviews with homeless individuals to develop a theory explaining the factors that contribute to homelessness and the strategies they use to cope. • Simulation and Modeling: Climate scientists use computer models to simulate the effects of various greenhouse gas emission scenarios on global temperatures and sea levels. • Case-Control Study: Epidemiologists investigate a disease outbreak by comparing a group of individuals who contracted the disease (cases) with a group of individuals who did not (controls) to identify potential risk factors. Research Design Examples
  • 23.