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st: > mfx from probit for variables for which I initially get the message "predicts failure perfectly" >


From   Luca Fumarco <luca.fumarco@lnu.se>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: > mfx from probit for variables for which I initially get the message "predicts failure perfectly" >
Date   Tue, 24 Apr 2012 12:00:28 +0200

Dear Statalisters,

I am using a probit model, and for a couple of variables I receive the message "predicts failure perfectly".
There is no convergence.
However, since it is a probit model, when I am interested in are the marginal effects.
Thus, I go on and use mfx, Stata produces the marginal effects of those couple of variable too.
Are those values meaningful? Or I should change strategy, switching to firthlogit (which cope with the problem of separation)


Luca Fumarco

Ph.D. Student
Linnæus University

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