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Re: st: When is the t-test appropriate?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: When is the t-test appropriate?
Date   Thu, 29 Aug 2002 09:43:08 -0700 (PDT)

--- Jon Wainwright &lt;jwainwright@austin.rr.com&gt;
wrote:
&gt; I would like to compare the means of two very
small
&gt; random samples (n1=3,
&gt; n2=7). Both samples were drawn from populations
of
&gt; unknown distribution. 

With that size (3 &amp; 7)I would not use an
asymptotic test. Use a non-parametric Mann-Whitney U
(wilcoxon)test. See the -ranksum- command in Stata.

Ricardo.

=====
Ricardo
Statistician 
Center for Applied Research
University Hospital
Oklahoma City,OK

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