This article reviews and summarizes the empirical sampling studies of the effects of variance heterogeneity in the analysis of variance. The general conclusion of these studies, that heterogeneity of variance is not an occurrence of importance, is only demonstrated for the simple randomized design; it remains to be demonstrated for the more complex designs. There is also a general inattention to E(MS) and to the effects of the sampling model upon E(MS) and F.
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