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st: Re: xtprobit and missing s.e.


From   "jyotsna puri" <pjyotsna@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: xtprobit and missing s.e.
Date   Wed, 13 Apr 2005 18:12:11 +0000

Hi all,

[I have looked up previous postings on this, but found that
although they helped me in some things, they don't
help to answer my ultimate question.]

Quick summary: I run an -xtprobit- and get missing s.e. for
Lnsig2u, sigma_u and rho. I run -vce- and get a full matrix
of variance/covariances. For lnsig2u, I get 0s in
all columns.

I am keen to understand what this means.




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