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st: How to keep track on observations used in the model


From   "Supnithadnaporn, Anupit" <anupit.supnithad@gatech.edu>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: How to keep track on observations used in the model
Date   Sun, 9 Aug 2009 14:04:22 -0400 (EDT)

Dear Stata List Users,

When I run several logit models, Stata drops 176 observations with the warning
"varX != 0 predicts failure perfectly". I want to run the models using the same
set of observations.

How would I know which observations that Stata drops?
Does Stata have some command to track or keep the observations that used in the
last regression? 

Thank you,
Anupit


-- 
Anupit Supnithadnaporn
PhD Candidate
School of Public Policy
Georgia Institute of Technology
D.M.Smith Building TPAC Room 018
685 Cherry Street
Atlanta GA 30332


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