This document includes these contents: Problem definition, document retrieval, effect sizes and computation, analysis of effect sizes, publication bias, cutting edge issues,. Invite you to result. | Practical Meta-Analysis -- D. B. Wilson Practical Meta-Analysis David B. Wilson Evaluators’ Institute July 16-17, 2010 Practical Meta-Analysis -- D. B. Wilson Overview of the Workshop Topics covered will include Review of the basic methods Problem definition Document Retrieval Coding Effect sizes and computation Analysis of effect sizes Publication Bias Cutting edge issues Interpretation of results Evaluating the quality of a meta-analysis Practical Meta-Analysis -- D. B. Wilson Forest Plot from a Meta-Analysis of Correctional Boot-Camps Practical Meta-Analysis -- D. B. Wilson The Great Debate 1952: Hans J. Eysenck concluded that there were no favorable effects of psychotherapy, starting a raging debate 20 years of evaluation research and hundreds of studies failed to resolve the debate 1978: To proved Eysenck wrong, Gene V. Glass statistically aggregate the findings of 375 psychotherapy outcome studies Glass (and colleague Smith) concluded that . | Practical Meta-Analysis -- D. B. Wilson Practical Meta-Analysis David B. Wilson Evaluators’ Institute July 16-17, 2010 Practical Meta-Analysis -- D. B. Wilson Overview of the Workshop Topics covered will include Review of the basic methods Problem definition Document Retrieval Coding Effect sizes and computation Analysis of effect sizes Publication Bias Cutting edge issues Interpretation of results Evaluating the quality of a meta-analysis Practical Meta-Analysis -- D. B. Wilson Forest Plot from a Meta-Analysis of Correctional Boot-Camps Practical Meta-Analysis -- D. B. Wilson The Great Debate 1952: Hans J. Eysenck concluded that there were no favorable effects of psychotherapy, starting a raging debate 20 years of evaluation research and hundreds of studies failed to resolve the debate 1978: To proved Eysenck wrong, Gene V. Glass statistically aggregate the findings of 375 psychotherapy outcome studies Glass (and colleague Smith) concluded that psychotherapy did indeed work Glass called his method “meta-analysis” Practical Meta-Analysis -- D. B. Wilson The Emergence of Meta-analysis Ideas behind meta-analysis predate Glass’ work by several decades Karl Pearson (1904) averaged correlations for studies of the effectiveness of inoculation for typhoid fever R. A. Fisher (1944) “When a number of quite independent tests of significance have been made, it sometimes happens that although few or none can be claimed individually as significant, yet the aggregate gives an impression that the probabilities are on the whole lower than would often have been obtained by chance” (p. 99). Source of the idea of cumulating probability values Practical Meta-Analysis -- D. B. Wilson The Emergence of Meta-analysis Ideas behind meta-analysis predate Glass’ work by several decades W. G. Cochran (1953) Discusses a method of averaging means across independent studies Laid-out much of the statistical foundation that modern meta-analysis is built .
