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st: RE: question about survey commands


From   "Carter Rees" <carterrees@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: question about survey commands
Date   Wed, 21 Nov 2007 23:04:28 -0500

Deepankar,

Follow the link to the UCLA Stats page:  

http://www.ats.ucla.edu/STAT/stata/faq/svyttest.htm

Carter


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of DEEPANKAR BASU
Sent: Wednesday, November 21, 2007 9:34 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: question about survey commands

Hi All,

I am working with Stata version 8.2 in Windows Vista. I am working with a
survey dataset (the Demographic and Health Surveys for India). 

After generating some variables, I do a t-test to test for the equality of
means (of the relevant variables) and store some results of the test as
follows:

ttest nsibg==nsibb, unpaired unequal
local nsibeff = r(mu_1) - r(mu_2)
local g3 = r(t)

ttest nwfsb==nwfsg, unpaired unequal
local nboeff = r(mu_1) - r(mu_2)
local g4 = r(t)

(later I use these local variables).

Since the data does not come from a simple random sample, the standard
errors and test statistics are not correct. How do I go about doing the
above computations taking account of the fact that I am working with a
complex survey dataset?

I can use the *svyset* command to tell Stata the details of the survey
design (pweights, psu and strata). But I do not know how proceed after that.
Any help will be greatly appreciated.

Deepankar

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