Revisiting the t test on ranks as an alternative to the Wilcoxon Rank-Sum test

Author(s): Sawilowsky, S. S.

Journal/Book: Percept Mot Skills. 1997; 85: PO Box 9229, Missoula, MT 59807. Perceptual Motor Skills. 399-402.

Abstract: In comparison with the Student t test, the test on the ranks of scores has been shown to be slightly less powerful than the Wilcoxon Rank-Sum test conducted on the original scores for real smooth and symmetric data sets because it does nor provide a correction for ties or continuity. Here it is demonstrated that the t test on ranks is nonetheless superior to the usual t test for real data that are skewed or otherwise severely nonnormally distributed.

Note: Article Bridge PD, Wayne State Univ, Ctr Hlth, Sch Med, 4201 St Antoine, Room 4J, Detroit,MI 48201 USA

Keyword(s): POWER

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