Performance of traditional f tests in repeated measures designs under covariance heterogeneity |
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| Authors: | Huynh Huynh Leonard S. Feldt |
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| Affiliation: | 1. University of South Carolina;2. University of Iowa |
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| Abstract: | This study investigates the performance of two traditional F tests, one for main effects and the other for interaction in repeated measures designs under several conditions of covariance heterogeneity. Overall, the test for interaction is more vulnerable than the one for main effects. Distortion in the level of significance is less serious for the case of equal group size. |
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| Keywords: | split-ploz designs mixed effect designs non-sphericity assumption violations covariance matrix heteroqeneity |
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