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Improved Significance Probabilities of the Wilcoxon Test

J. L. Hodges, Jr., Philip H. Ramsey and Sergio Wechsler
Journal of Educational Statistics
Vol. 15, No. 3 (Autumn, 1990), pp. 249-265
DOI: 10.2307/1165034
Stable URL: http://www.jstor.org/stable/1165034
Page Count: 17
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Improved Significance Probabilities of the Wilcoxon Test
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Abstract

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.

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