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PSPP-BUG: [bug #47041] Mann Whitney U test results are not correct

From: anonymous
Subject: PSPP-BUG: [bug #47041] Mann Whitney U test results are not correct
Date: Mon, 01 Feb 2016 15:02:07 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0


                 Summary: Mann Whitney U test results are not correct
                 Project: PSPP
            Submitted by: None
            Submitted on: Mon 01 Feb 2016 03:02:06 PM UTC
                Category: Numerical Errors
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00




When I run Mann Whitney U test, results are not matched with the results from
other statistical softwares. Besides, I tried to use Kruskal-Wallis test for 2
group, and Kruskal-Wallis results are matched with the results of other
statistical softwares.

I realized that this error occurs with stable versions and nightly builds.

I use Kruskal-Wallis for two groups instead of Mann Whitney U test for now.
But it comes with practical issues (e.g. when I try to compare group 1 and
group 3, I have to recode groups to different variable, because K-W includes
group 2 too.)


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