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Research Synthesis (Meta-Analysis)

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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  1. CHAPTER 10 CHAPTER 1 Research Synthesis (Meta-Analysis) Research Synthesis (Meta-Analysis)

  2. 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 - Design (continued)

  3. Contrasting Meta-Analysis With Literature Review • How did the author arrive at conclusions? - Vote counting - Differential weighting

  4. 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 metric.

  5. Steps in a Meta-Analysis • Identification of a problem • Literature searched by specified means • Review of studies to determine inclusion or exclusion • 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

  6. Calculating Effect Size

  7. Distribution Overlap When Group 1 and Group 2 Are 1s Apart (ES = 1.0)

  8. 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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