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Re: st: Survey variance estimates - large software differences


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "'Statalist'" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Survey variance estimates - large software differences
Date   Tue, 30 Jun 2009 13:04:13 -0500

At 11:41 AM 6/30/2009, Levinson, Arnold wrote:
Survey analysis experts:
I have data from a stratified two-stage school survey. The first stage sampled schools within strata, the second sampled classrooms within selected schools.

When estimating variables of interest at the school level, I get hugely different variance estimates running Stata vs. SAS or SUDAAN. Stata's estimates are generally a lot smaller than SAS's or SUDAAN's, and the latter to are similar or identical to each other.

Have you (or anyone else) compared results across the 3 programs using other data sets? It might be helpful to know if this always happens or is unique to this data set. My first guess would be that the design statements really aren't equivalent, but then again there could be some systematic difference across the programs.


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Richard Williams, Notre Dame Dept of Sociology
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EMAIL:  Richard.A.Williams.5@ND.Edu
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