title: Meta-analysis at middle age: a personal history.
abstract: 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.
authors.affiliation: Arizona State University, Phoenix, AZ, USA.|University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Gene V
authors.initials: GV
authors.lastname: Glass
mesh_terms: D035843:Biomedical Research / Q000266:history*; D002986:Clinical Trials as Topic / Q000266:history*; D003627:Data Interpretation, Statistical; D049673:History, 20th Century; D049674:History, 21st Century; D015201:Meta-Analysis as Topic; D012107:Research Design; D012196:Review Literature as Topic
keywords: meta-analysis; psychotherapy; research synthesis