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The term meta-analysis refers to the statistical analysis of results from individual studies for purposes of integrating the findings. The person who coined the term in 1976, Gene Glass, felt that the accumulated findings of studies should be regarded as complex data points that were no more comprehensible without statistical analysis than the data points found in individual studies.

Procedures for performing meta-analysis had appeared in statistics texts and articles long before 1976, but instances of their application were rare. It took the expanding evidence in the social sciences and the growing need for research syntheses to provide impetus for the ...

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