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Meta-analysis of raw mean differences
Charles F Bond1, Wyndy L Wiitala, F Dan Richard
1Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA. c.bond@tcu.edu
Psychological Methods
|December 11, 2003
Abstract:
This article discusses the meta-analysis of raw mean differences. It presents a rationale for cumulating psychological effects in a raw metric and compares raw mean differences to standardized mean differences. Some limitations of standardization are noted, and statistical techniques for raw meta-analysis are described. These include a graphical device for decomposing effect sizes. Several illustrative data sets are analyzed.