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PSPP-BUG: [bug #26936] T-TEST reports 2-p instead of p

From: John Darrington
Subject: PSPP-BUG: [bug #26936] T-TEST reports 2-p instead of p
Date: Wed, 15 Jul 2009 06:21:39 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/2009032803 Iceweasel/3.0.6 (Debian-3.0.6-1)

Follow-up Comment #4, bug #26936 (project pspp):

Okay - thanks for clarifying the problem.

When I run the example you gave,  I get a T value of -Infinity for the Equal
Variances case, and NaN for the Unequal Variances case.  Consequently all
other figures are NaN (except the Mean Difference).

I'm rather intrigued that you get a finite T-Value at all.  What platform are
you running on?

The results I'm seeing are probably not strictly correct, but are
understandable since, as one of the groups has only 1 member, the variance is
zero - and division by zero is undefined.

But I'm concerned when you say that "other paired-samples tests" are giving
the wrong answer too.  Do any of these other examples
have group sizes larger than 1 ?   If so, can you post example syntax files
which demonstrate the problem.


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