From the course: Meta-analysis for Data Science and Business Analytics

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Combine many empirical findings

Combine many empirical findings

From the course: Meta-analysis for Data Science and Business Analytics

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Combine many empirical findings

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- [Narrator] Back in the 1970s a statistician named Gene Glass became angry at the writings in professional journals by a psychologist named Hans Eysenck. Eysenck claimed that psychotherapy was merely a placebo. Although Glass had personal reasons for his disagreement with Eysenck, he also had reasons that were grounded in rigorous, statistical analysis, sound experimental design and systematic, as distinct from arbitrary, selection of evidence. Glass believed that Eysenck had cherry picked studies of psychotherapy to make the ones he agreed with look authoritative and the ones he disagreed with look simpleminded. In doing so he made several decisions that were at best questionable and at worst outrageous. Let's get into what I mean by that. Eysenck first eliminated from consideration all studies that did not appear in peer-reviewed journals. Thus, he discarded all the meaningful, carefully conducted research on psychotherapy that was conducted and submitted in support of PhD degrees…

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