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st: weighted t-test


From   rosa <rosahh.rosa@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: weighted t-test
Date   Wed, 18 Jan 2012 15:26:16 +0100

Hi,

I want to perform a weighted t-test using survey data. Given I cannot
apply the 'ttest' command together with 'svy', I am using the 'lincom'
command (as learned in stata's FAQ).

My question is: Is testing the difference between different groups
(x1-x1) the same as testing whether the difference between groups is
significantly different than the average of the sample?

This is what I've  done:

svyset count [iw= WEEGFACT]
tab gender, gen(x)
sum x1 x1
svy: reg nr_pos x1 x2, nocons
lincom x1-x2

Thank you in advance.

Rose
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