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Re: st: mean difference test.


From   Fernando Rios Avila <f.rios.a@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mean difference test.
Date   Fri, 14 Sep 2012 15:40:19 -0400

Thanks a lot.

On Fri, Sep 14, 2012 at 12:11 PM, Steve Samuels <sjsamuels@gmail.com> wrote:
>
> 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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