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An Evaluation of Rosenthal and Rubin’s Binomial Effect Size Display

University of North Texas

The binomial effect size display (BESD) has been proposed by Rosenthal and Rubin (1979, 1982; Rosenthal, 1990; Rosenthal & Rosnow, 1991) as a format for presenting effect sizes associated with certain experimental and nonexperimental research. An evaluation of the BESD suggests that its application is limited to presenting the results of 2 x 2 tables where is employed as the index of effect size. Findings indicate that the BESD provides little added information beyond an examination of the raw percentages in the 2 x 2 table and dramatically distorts effect sizes when binomial success rates vary from .50.

Key Words: BESD • binomial effect size display • coefficient of determination • correlation coefficient • effect size • phi coefficient

Journal of Educational and Behavioral Statistics, Vol. 22, No. 1, 109-117 (1997)
DOI: 10.3102/10769986022001109


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