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Evaluation & the Health Professions
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Meta-Analysis at 20

Retrospect and Prospect

Kenneth A. Kavale

University of Iowa

It has been 20 years since Gene Glass reinvigorated research integration through the formalization of meta-analysis. This article explores the nature of meta-analysis by placing it within the context of research synthesis. The methods of meta-analysis are described briefly and compared and contrasted with other forms of research integration. In addition, the findings from several meta-analyses are provided to show the advantages of quantitative review methods. Finally, criticisms of meta-analyses are analyzed; as are several unanswered questions about the direction of meta-analysis.

Evaluation & the Health Professions, Vol. 18, No. 4, 349-369 (1995)
DOI: 10.1177/016327879501800402
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