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st: RE: t-test


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: t-test
Date   Tue, 28 Mar 2006 10:29:54 +0100

As far as I can understand this, your problem
sounds like an analysis of variance problem. 
It is possible to cycle through t tests for 
all distinct pairs of categories, in Stata as in other 
software, but it seems 
to be generally considered that looking at the problem as 
a whole is preferable on a variety of statistical 
and scientific grounds. 

In any case, doing t-tests separately doesn't make
them independent of each other. 

Nick 
n.j.cox@durham.ac.uk 

P chrisman
 
> Is there a way to do a t-test of the difference in means for an 
> unordered categorical variable. I have an unordered 
> categorical variable 
> and I want to compare the means between group 0 (the reference group) 
> and groups 2, 3, 4 individually. I initially thought to do a 
> regression 
> using the xi: regress command with i.unordered categorical 
> variable, but 
> I am unsure if this is equivalent to separate t-tests for group 0 
> compared to each group 2, 3 and 4 separately. Any 
> comments/suggestions would be greatly appreciated.

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