An Empirical Study of Hedges's Homogeneity Test

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Abstract

The behavior of the Hedges's (1982) Q test for the fixed-effects meta-analytic model was investigated for small and unequal study sample sizes paired with larger numbers of studies, nonnormal score distributions, and unequal variances. The results of a Monte Carlo study indicate that the hypothesis of equal effect sizes tends to be rejected less than expected if smaller study sample sizes are paired with larger numbers of studies; pairing smaller variances with larger sample sizes (or vice versa) leads to this hypothesis being rejected more than expected. The power of the Q test is also less than expected when small study sample sizes are paired with larger numbers of studies. These findings suggest conditions for which the Q test should be used cautiously.

Original languageEnglish (US)
Pages (from-to)219-231
Number of pages13
JournalPsychological Methods
Volume2
Issue number2
DOIs
StatePublished - Jun 1997
Externally publishedYes

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