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st: RE: subpops within subpops using svy commands


From   "Sayer, Bryan" <BSayer@s-3.com>
To   "'karen matsuoka '" <kmatsuoka@angelfire.com>, "'statalist@hsphsun2.harvard.edu '" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: subpops within subpops using svy commands
Date   Mon, 9 Jun 2003 18:23:03 -0400

An unfortunate 'feature' in Stata is that you have to create a single
variable for each sub-pop you wish to analyze.  So you need to create a
variable something like

generate byte poordiabetics = pov < 1 & diabetes = 1

for example, and do this for every subpop you wish to analyze.  Be careful
of missing values.

Bryan Sayer
Statistician, SSS Inc. 

-----Original Message-----
From: karen matsuoka
To: statalist@hsphsun2.harvard.edu
Cc: Sayer, Bryan
Sent: 6/9/03 5:26 PM
Subject: subpops within subpops using svy commands

I would like to conduct a logistic regression using the svylogit command
on a sub-sample of a subsample of a complex survey sample. 

I understand that the appropriate way to work with sub-samples with
svy-commands is to use the subpop command. However, Stata seems to allow
only one subpop. 

What if I want to look at a subpopulation of a subpopulation (for
example, only individuals with incomes below federal poverty level who
also have diabetes)? If I were to use the subpop command to select those
people with diabetes, and then the "if" command to select only those
people with the income level I am interested in, will that work or will
that throw all of the standard errors off? 

Any advice would be greatly appreciated!

---
Karen



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