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st: ttest


From   Seok-Woo Kwon <[email protected]>
To   [email protected]
Subject   st: ttest
Date   Fri, 23 Aug 2013 11:47:26 -0400

Hello,

I want to performs t-tests for four groups (group1 vs. group2, group 2
vs. group3, etc). When I tried "ttest math_score, by(group)",  it
gives an error message: "more than 2 groups found, only 2 allowed."

Is there a way to do this without writing command for each comparison?

Thanks.

Seok-Woo Kwon
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