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From: | Dr. Walter Statistics |
Subject: | Re: Error in computation of Mann-Whitney-U Test |
Date: | Sat, 4 Mar 2017 23:14:33 +0100 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 |
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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