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Evaluation Review, Vol. 4, No. 5, 645-656 (1980)
DOI: 10.1177/0193841X8000400506

Other

The Power of t and Wilcoxon Statistics

A Comparison

R.Clifford Blair

University of South Florida

J.J. Higgins

Kansas State University

Computer-generated Monte Carlo techniques were used to assess the relative power of Wilcoxon's rank-sum test and the independent means t test under a certain mixed normal distribution. Results showed a very largepoweradvantagefor the Wilcoxon statistic. This indicates that the very large advantages promised by asymptotic theory may be obtained with samples of sizes commonly encountered in social science research.


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