Type I Error Probabilities and Power of the Rank and Parametric Ancova Procedures

Samuel L. Seaman, James Algina and Stephen F. Olejnik

Journal of Educational and Behavioral Statistics, 1985, vol. 10, issue 4, 345-367

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: ANCOVA; rank ANCOVA (search for similar items in EconPapers)
Date: 1985
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:10:y:1985:i:4:p:345-367

DOI: 10.3102/10769986010004345

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