| Abstract: | Power and stability of Type I error rates are investigated for the Box-Scheffé test of homogeneity of variance with varying subsample sizes under conditions of normality and nonnormality. The test is shown to be robust to violation of the normality assumption when sampling is from a leptokurtic population. Subsample sizes which produce maximum power are given for small, intermediate, and large sample situations. Suggestions for selecting subsample sizes which will produce maximum power for a given n are provided. A formula for estimating power in the equal n case is shown to give results agreeing with empirical results. |
