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Improved Significance Probabilities of the Wilcoxon Test

Author

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  • J. L. Hodges Jr.
  • Philip H. Ramsey
  • Sergio Wechsler

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.

Suggested Citation

  • J. L. Hodges Jr. & Philip H. Ramsey & Sergio Wechsler, 1990. "Improved Significance Probabilities of the Wilcoxon Test," Journal of Educational and Behavioral Statistics, , vol. 15(3), pages 249-265, September.
    • Handle: RePEc:sae:jedbes:v:15:y:1990:i:3:p:249-265
    DOI: 10.3102/10769986015003249
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    Keywords

    Mann-Whitney U test; exact probabilities;

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