The 40-year history of meta-analysis is traced from the vantage point of one of its originators. Research syntheses leading to the first examples of meta-analysis are identified. Early meta-analyses of the literature on psychotherapy outcomes and school class size are recounted. The influence on the development of meta-analysis of several statisticians and psychologists is described. Finally, some directions for future development of research synthesis methods are suggested.
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Gene V. Glass (2015) studied this question.
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