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Re: st: mean difference test.


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mean difference test.
Date   Fri, 14 Sep 2012 12:11:45 -0400

Compare Sample B to the rest of A. This is equivalent to comparing
B with all of A. There is an example in point 1 of:
http://www.stata.com/statalist/archive/2008-09/msg00869.html

Steve

On Sep 14, 2012, at 10:22 AM, Fernando Rios Avila wrote:

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.
Fernando
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