ISSN 2043-8087
Journal of Experimental Psychopathology
 Volume 2, Issue 2, 294-317, 2011
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A Primer on Meta-analysis in Clinical Psychology

Scott A. Baldwin (a), William R. Shadish (b)
(a) Department of Psychology, Brigham Young University
(b) School of Social Sciences, Humanities, and Arts, University of California, Merced.

Volume 2, Issue 2, 2011, Pages 294-317

The authors provide a primer on meta-analysis. Topics are covered at an introductory level and references are provided for readers wanting further information. Topics covered include literature search procedures, coding manuals and extracting information from studies, calculating effect sizes, combining effect sizes, fixed and random effects analysis, influence analysis, moderator analysis, multivariate meta-analysis, and publication bias. All analyses are illustrated using k = 18 behavioral marital therapy versus control studies. The authors conclude by considering criticisms of meta-analysis, introducing reporting standards in meta-analysis, and reviewing software options for meta-analysis. An appendix for the paper includes the data and annotated Stata code for replicating the results presented.

Table of Contents
The Process of Meta-analysis
  Identifying Studies
  Coding Information about Studies
  Computing Effect Sizes
  Aggregating Effect Sizes
  Interpreting the Overall Analysis
  Influence Analysis
  Moderator Analysis
  Multivariate Analysis
  Publication Bias
Additional Considerations
  Statistical Power
  Combining Apples and Oranges
  Reporting Standards
  Software Options

Correspondence to
Scott A. Baldwin, 268 TLRB, Brigham Young University, Provo, UT 84660.

meta-analysis, quantitative review, effect size, research synthesis

Received 28 Jul 2010; Revised 19 Oct 2010; Accepted 20 Oct 2010; In Press 5 May 2011

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