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st: logit and mfx
From 
 
"Figueroa Armijos, Maria Augusta (MU-Student)" <[email protected]> 
To 
 
"[email protected]" <[email protected]> 
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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