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Adjusting for Unequal Variances When Comparing Means in One-Way and Two-Way Fixed Effects ANOVA Models

University of Southern California

Numerous papers have shown that the conventional F test is not robust to unequal variances in the one-way fixed effects ANOVA model, and several methods have been proposed for dealing with this problem. Here I describe and compare two methods for handling unequal variances in the two-way fixed effects ANOVA model. One is based on an improved Wilcox (1988) method for the one-way model, which forms the basis for considering this method in the two-way ANOVA model. The other is an extension of James’s (1951) second order method.

Key Words: heteroscedasticity • James’s method • Welch’s procedure

Journal of Educational and Behavioral Statistics, Vol. 14, No. 3, 269-278 (1989)
DOI: 10.3102/10769986014003269


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