Responds to L. M. Hsu's proposal of a statistical procedure for testing the difference between effect sizes in independent studies. It is shown that the test proposed by Hsu is incorrect and that it tends to reject the null hypothesis of equal effect sizes too often. The statistical model underlying effect size estimation is clarified, and the exact distribution of the effect size estimator is given. The distribution is used to show that the usual size estimator is biased. (6 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved).
- statistical procedure for testing difference between effect sizes, criticism of L. M. Hsu's proposal
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