st: -by varname- and -est store-

[Bernhard Ganglmair (BGSE) <bganglma@uni-bonn.de>]

Hi,

I am struggling with -by- and the -estimates- command. Hopefully 
somebody can give me a hint.

I estimate a bivariate probit model for each value of the variable 
varname using clustered data, i.e. for various sub-populations defined 
by varname. The first approach that came into my mind was just running 
the biprobit with if varname==some value. The Stata manual on survey, 
however, tells me that I would incorrect variance estimates if I used 
-if-. It is suggested to use the by() or subpop() option. Since 
byprobit doesn't allow for by() or subpop() [version 8; no 
svybiprobit], I am running the following:

by varname, sort: biprobit y1 y2 varlist, cluster(ea)

For each value of varname I'd like to store the estimation results, 
-est store- however gives me only the results of the last value in 
varname.

How do I address results generated using -by-?

Best, Bernhard

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