| Date: | Mon, 21 Aug 2000 04:04:26 -0700 |
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| Reply-To: | Philip Whittall <philip.whittallNOphSPAM@UNILEVER.COM.INVALID> |
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| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
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| From: | Philip Whittall <philip.whittallNOphSPAM@UNILEVER.COM.INVALID> |
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| Organization: | http://www.remarq.com: The World's Usenet/Discussions Start Here |
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| Subject: | Re: proc ttest p-values interpretation |
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I think the important point is that the
p-values for the t-test are valid only if
the variances of the 2 populations are equal.
You should check the p-values under this
assumption and the p-values under the assumption
that they are different - if you're lucky they'll
be nearly equal. If the test for equality of the
variances is significant then take the p-value
for unequal variances.
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