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Research Synthesis (Meta-Analysis) PowerPoint PPT Presentation

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CHAPTER 10. CHAPTER 1. Research Synthesis (Meta-Analysis). Research Synthesis (Meta-Analysis). Contrasting Meta-Analysis With Literature Review. •How thorough was the literature search?. -Computer search and hand search -Which journals? -Theses and dissertations included?.

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Research Synthesis (Meta-Analysis)

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Research Synthesis


Research Synthesis


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Contrasting Meta-Analysis

With Literature Review

•How thorough was the literature search?

-Computer search and hand search

-Which journals?

-Theses and dissertations included?

•On what basis were studies included or excluded?

-Perceived internal validity

-Sample size



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Contrasting Meta-Analysis

With Literature Review

•How did the author arrive at conclusions?

-Vote counting

-Differential weighting

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Purpose of Meta-Analysis

•Answer an important question when adequate

literature is available.

•Report a definitive methodology for the review.

•Quantify the results of studies using a standard


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Steps in a Meta-Analysis

•Identification of a problem

•Literature searched by specified means

•Review of studies to determine inclusion or


•Careful reading and evaluation to identify and

code important study characteristics

•Calculating effect size

•Applying appropriate statistical analyses

•Reporting all the steps and outcomes in a paper

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Calculating Effect Size

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Distribution Overlap When Group 1 and Group 2

Are 1s Apart (ES = 1.0)

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Methodological Considerations

in Meta-Analysis

•Deciding what to code: Using theory and empirical

studies to decide on characteristics of importance

•Choosing the standard deviation for ES

-Experimental versus control

-Nonrandomly formed groups (sex, age)

-Pretest to posttest

•Correcting ES

•Weighting ES

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