Re: Error in computation of Mann-Whitney-U Test

[John Darrington]

On Sat, Mar 04, 2017 at 08:38:45PM +0100, Dr. Walter Statistics wrote:
     I checked it by using a published data set and three different
     statistical programs including PSPP. I could not find any significant
     differences between the results. PSPP's Mann Whitney U test procedure
     seems to be working properly.
     
If Mandy's problem is the one I suspect it is, then it only manifests
itself when there are cases in the dataset which do not belong to either
group.

J'


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