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

From   "Hixson, Eric" <>
Subject   st: RE: RE: -robust cluster()- with an -if-
Date   Fri, 17 Sep 2004 13:23:01 -0400

Thanks for the clarification.

-----Original Message-----
[]On Behalf Of Nick Cox
Sent: Friday, September 17, 2004 10:37 AM
Subject: st: RE: -robust cluster()- with an -if-

In general an -if- condition in Stata means 
that all observations not meeting 
that condition are ignored, absolutely. 

There is no question of anything superseding anything 
else, or vice versa. 


Hixson, Eric
> 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!

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