Research Design Overview Heather M. Gray, Ph.D. January 26, 2010 Research Methods for the Social Sciences: An Introductory Course.

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Presentation transcript:

Research Design Overview Heather M. Gray, Ph.D. January 26, 2010 Research Methods for the Social Sciences: An Introductory Course

Today’s Plan Lecture: The 5 basic types of research approaches in the social sciences Interactive exercise #1: Does watching too much TV kill you? Interactive exercise #2: Name that Method (time permitting)

Primary Sources Rosenthal, R. & Rosnow, R. L. (1991). Essentials of Behavioral Research: Methods and Data Analysis Research Methods: The Laboratory /login.html

5 Basic Approaches Experiments Everything Else CorrelationNaturalistic Observation SurveyCase Study

Experiments Description: Manipulating a variable to see if it changes a second variable Independent variable Dependent variable X Y

Experiments Strengths: Cause-and-effect relationships, IF: Statistical conclusion validity Construct validity Internal validity External validity

Experiments Limitations: Necessary trade-offs “Truth accrues, error cancels out” (attributed to Robert Rosenthal) RigorRelevance

Experiments Limitations: Not always practical Not always ethical

5 Basic Approaches Experiments Everything Else CorrelationNaturalistic Observation SurveyCase Study

Correlation Description: No manipulation Designed to determine degree and direction of relationship between two variables X Y

Correlation Strength: No manipulation Useful for prediction

Correlation Limitations: Correlation cannot prove causation

5 Basic Approaches Experiments Everything Else CorrelationNaturalistic Observation SurveyCase Study

Naturalistic Observation Description: Careful observation and recording of some behavior or phenomenon Over a prolonged time In its natural setting Without interference

Naturalistic Observation Strengths: Observation of behavior as it occurs naturally Limited opportunity for experimenter effects Can yield hypotheses for future experimental investigation

Naturalistic Observation Limitations: Descriptive method, not explanatory Time intensive Difficulty of observing behavior without disrupting it Coding issues

5 Basic Approaches Experiments Everything Else CorrelationNaturalistic Observation SurveyCase Study

Survey Description: Descriptive study Inferences drawn from interviews or questionnaires Different types of questions Forced-choice Open-ended

Survey Strength: When constructs are difficult to observe directly Standardization Cost-effective Relatively quick

Survey Limitations: No cause-and-effect conclusions Reliance on self-reports Deception Poor memory Misunderstanding of question Lack of insight Predicting behavior?

5 Basic Approaches Experiments Everything Else CorrelationNaturalistic Observation SurveyCase Study

Case Study Description: In-depth descriptive record of an individual or small group of individuals Biographical data, medical records, family history, observations, interviews, psychological tests

Case Study Strengths: Provide detailed, contextual view If long term, helpful in understanding developmental issues Helpful in generating hypotheses for future testing

Case Study Limitations: Not explanatory; no cause-and-effect relationships Behavior can be observed but not explained Lack of generalizability Issues re: retrospective data

Take-home point #1 On choosing your own research method Don’t be limited to just one approach Use combination of approaches to help correct for inherent weaknesses

Take-home point #2 On being an educated consumer of research Are conclusions warranted by the study design? Example…

Interactive Exercise #1 How else could we have addressed this question? Naturalistic observation Survey Case study Experiment?

Interactive Exercise #2 Name that Method