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st: No Standard Errors in MLOGIT

From   Charles Parekh <>
Subject   st: No Standard Errors in MLOGIT
Date   Fri, 21 Apr 2006 16:23:20 -0400


I have a question about the mlogit command in stata.

I am using Stata 9/SE on a Windows XP machine. I am using the syntax

mlogit yvar x1 x2 x3 x4, robust

When I do so, I get output that makes sense except for the constant produces a coefficient but no standard error. Is there some reason for this? I am assuming there is some within group collinearity, but why would the procedure produce a coefficient and no standard error? Also, if there is multicollinearity, it is not perfect multicollinearity, I have checked that.

Any idea?



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