I cannot confirm your objection, John. I checked it again, now with a
published data set of 3 - three - different groups. I ran three Mann
Whitney U tests (group 1 vs 2 excluding the cases of group 3, group 1 vs
3 excluding the cases of group 2, group 2 vs 3 excluding the cases of
group 1). There were no differences. PSPP seems to be working properly.
I did not find anything of importance. There seems to be no problem at all.
Prof Nuszbaum has to be more specific in describing her problem.
Kind regards,
Oliver Walter
Am 04.03.2017 um 20:46 schrieb 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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