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Mann Whitney U Test

  1. Jun 6, 2008 #1
    The question relate to the Mann Whitney U test with two populations.

    For the test statistic formula, there is a R1 term, which is the sum of the ranks of the "first" population. My question is, given any two populations, how do i decide which one is the "first" population?
  2. jcsd
  3. Jun 7, 2008 #2


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    The Mann Whitney U test essentially tests the absolute value of the difference in means of two populations. It doesn't matter which is the "first" and which is the "second" population.
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