PROPHET StatGuide: Mann-Whitney rank sum test

The rank sum test is used to test the null hypothesis that the two population distribution functions corresponding to the two random samples are identical against the alternative hypothesis that they differ by location.

(The Wilcoxon rank sum test is equivalent to the Mann-Whitney U test.)



To properly analyze and interpret results of the rank sum test, you should be familiar with the following terms and concepts:

If you are not familiar with these terms and concepts, you are advised to consult with a statistician. Failure to understand and properly apply the rank sum test may result in drawing erroneous conclusions from your data. Additionally, you may want to consult the following references:

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Last modified: March 18, 1997

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