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st: t-test


From   P chrisman <peggyc@u.washington.edu>
To   Stata List <statalist@hsphsun2.harvard.edu>
Subject   st: t-test
Date   Mon, 27 Mar 2006 22:18:07 -0800

Hi All,

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.
Thank you,

Peggy
University of Washington
Graduate Student, Biostatistics

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