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st: svylogit question / with a hypothetical


From   "David J. Bernstein" <dj_knight01@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: svylogit question / with a hypothetical
Date   Thu, 8 Apr 2004 17:04:24 -0700 (PDT)

Hello All,

I have a svylogit question.  

Here is my hypothetical:

Out of 20,000 patients I have a survey sample of 1000.
 In this sample I have weights that represent the
racial mix of the complete population.  


Here is the program:

svyset [pweight=weight], psu(ssn) strata(hospital)

svylogit recovered race age _Iyear*   (year dummies)


Now if I decide to drop the hosiptals that have
complete failure (i.e. recovered=0 for all)
does re-running the svylogit still yield valid
results?  In other words, do I have a weighting
problem from dropping, say, 50 observations because
they are from hospitals that had 0 recovery?  By doing
this I eliminate stratid's with 1 observation (and
crashing my run). 

What do you guys think?

-David



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