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Improved Significance Probabilities of the Wilcoxon Test

University of California—Berkeley

Philip H. Ramsey

Queens College of CUNY

Sergio Wechsler

Universidade de S. Paulo

An Edgeworth approximation for accurate significance probabilities for the Wilcoxon two-sample test is substantially simplified. A method is developed that allows quick and easy calculations of very accurate probabilities. Exact formulas are given for most of the remaining cases, and tables are presented comparing the accuracy of the new simplification relative to the most likely alternatives.

Key Words: Mann-Whitney U test • exact probabilities

Journal of Educational and Behavioral Statistics, Vol. 15, No. 3, 249-265 (1990)
DOI: 10.3102/10769986015003249


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