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st: RE: FPC & 2-stage cluster sampling


From   "Sayer, Bryan" <BSayer@s-3.com>
To   "'Ali Karim '" <mehryar@hotmail.com>, "'statalist@hsphsun2.harvard.edu '" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: FPC & 2-stage cluster sampling
Date   Tue, 3 Jun 2003 17:49:59 -0400

If the second stage is SRS with replacement and you are analyzing households
(not people in households), I THINK it is ok as is. If you know someone with
SUDAAN, you might be able to run a comparison, provided you have all the
necessary information for the sample design.

Bryan Sayer
Statistician, SSS Inc.

-----Original Message-----
From: Ali Karim
To: statalist@hsphsun2.harvard.edu
Sent: 6/3/03 10:35 AM
Subject: st: FPC & 2-stage cluster sampling

Dear Statalist readers,

I have a dataset with two-stage cluster sampling. In first stage 30
PSU's 
were selected randomly (without replacement) from a universe of 60
clusters 
(i.e. fpc = .5). On the second stage 30 households were selected
randomly 
from each PSU. I planned to analyze household attributes using Stata's
'svy' 
commands. I did the following:-

.svyset psu cluster
.svyset fpc frac

And then run my survey commands. The output gave me the following
comment:- 
"Finite population correction (FPC) assumes simple random sampling
without 
replacement of PSUs within each stratum with no sub-sampling within
PSUs". 
However, the assumption does not seem to hold for my sampling design. 
Therefore, I am not sure how the assumption affects my analysis. Am I
using 
the survey command correctly for my given situation?

Thanks in advance.
Ali

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