Type I Error Probabilities and Power of the Rank and Parametric Ancova Procedures
- 1 December 1985
- journal article
- Published by American Educational Research Association (AERA) in Journal of Educational Statistics
- Vol. 10 (4) , 345-367
- https://doi.org/10.3102/10769986010004345
Abstract
Empirical type I error rates and the power of the parametric and rank transform ANCOVA were compared for situations involving conditional distributions that differed between groups in skew and/or scale. For the conditions investigated in the study, the parametric ANCOVA was typically the procedure of choice both as a test of equality of conditional means and as a test of equality of conditional distributions. For those conditions in which rank ANCOVA was the procedure of choice, the power advantages were usually quite small.Keywords
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