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st: logit and mfx


From   "Figueroa Armijos, Maria Augusta (MU-Student)" <maf3nc@mail.mizzou.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: logit and mfx
Date   Mon, 14 Feb 2011 03:38:08 +0000

Hi all, 

I have a question about logit and mfx. 

I am running a logit model with three variants for the errors. First model is non-robust errors (logit Y X1 X2). Second model is with robust errors (logit Y X1 X2, vce(robust)). Third model is with clustered-robust errors (logit Y X1 X2, vce(cluster
 fips)).

When I run mfx after each model, I get the same values of dydx (first differences) for non-robust, robust, and clustered-robust errors. What am I doing wrong? I can't find any answer in previous questions in stata.  

Thanks a lot!
Maria 





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