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An Investigation of the Type I Error and Power Properties of the Rank Transform Procedure in Factorial ANOVA

Shlomo S. Sawilowsky, R. Clifford Blair and James J. Higgins
Journal of Educational Statistics
Vol. 14, No. 3 (Autumn, 1989), pp. 255-267
DOI: 10.2307/1165018
Stable URL: http://www.jstor.org/stable/1165018
Page Count: 13
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An Investigation of the Type I Error and Power Properties of the Rank Transform Procedure in Factorial ANOVA
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Abstract

This study examined the Type I error and power properties of the rank transform test when employed in the context of a balanced 2×2×2 fixed effects ANOVA. The results showed the rank transform procedure to be erratic with respect to both Type I error and power. Under some circumstances the test was both robust and powerful, whereas in other circumstances it was decidedly nonrobust and manifested power considerably below that of the usual ANOVA F test. It is recommended that researchers avoid this test except in those specific circumstances where its properties are well understood.

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