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Re: st: Survey variance estimates - large software differences
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.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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