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st: mean difference test.

From   Fernando Rios Avila <>
Subject   st: mean difference test.
Date   Fri, 14 Sep 2012 10:22:53 -0400

Dear Statalisters,
I wonder if anyone can point out what would be the appropriate test for
testing the mean differences of two samples (A and B), when Sample B is a
subsample of Sample A.
The context for this is to evaluate the severity of missing information in
sample B.
I ve been using a simple -ttest- , but it came to my attention that it
requires independent samples, which by construction is not the case in my
problem in hand.
thank you.
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