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st: identifying perfect outcome predictor


From   "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: identifying perfect outcome predictor
Date   Mon, 5 May 2008 12:33:48 -0500

Hi - I am running logistic regression on simulated data sets. However
sometimes one of the explanatory variables completely separates the
outcome variable and I get a message such as 

outcome = X2 <= .1955861 predicts data perfectly
r(2000);

Presumably if I get a return code of 2000, I know this has occurred -
but is there information in logit postestimation to tell which variable
gives perfect separation (as opposed to checking each one "by hand")?

Thanks

Al Feiveson

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