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st: -robust cluster()- with an -if-


From   "Hixson, Eric" <HIXSONE@ccf.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: -robust cluster()- with an -if-
Date   Fri, 17 Sep 2004 10:28:40 -0400

I am using the -robust cluster()- option with -logit- to address lack of independence of observations.  My question has to do with how Stata performs the operation when an -if- statement is also included.

I have a dataset composed of subjects (id) that may have multiple observations.  For each observation, the subject could have one of two levels of a certain characteristic (type = 0/1).  

If I specify "logit outcome var2 if type==1, robust cluster(id)", would observations for a given subject where type==0 be included in the determination of the robust standard errors [per the -cluster(id) statement] or would the sample first be limited by the -if type==1- before any modeling is done?

In other words, does -if- supercede -cluster()- or visa versa?  If this should be obvious, go easy on the caning and I'll keep reading!

Eric Hixson

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