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st: No Standard Errors in MLOGIT
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.
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