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Re: st: Re: Brant test


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Brant test
Date   Sat, 18 Oct 2008 15:16:41 +0200

Might want to try yourself with the example http://www.ats.ucla.edu/stat/stata/dae/ologit.htm...



HTH
Martin
_______________________
----- Original Message ----- From: "Gao Liu" <gao.liu@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, October 18, 2008 3:12 PM
Subject: Re: st: Re: Brant test


Thank you, Martin,

I guess that may be the reason, as some of the categories do have
relatively small number of observations. Since the Brant test does not
work, I used the gologit regression, and did Wald tests. Will they
generate the same results as those from the Brant test?

Thank you

Gao



On Sat, Oct 18, 2008 at 9:04 AM, Martin Weiss <martin.weiss1@gmx.de> wrote:
as -rnethelp "http://www.indiana.edu/~jslsoc/stata/spost9_ado/brant.hlp"-
says:

"This is most likely not to be the case with models that have few
observations in
the extreme categories and many independent variables."

HTH
Martin
_______________________
----- Original Message ----- From: "Gao LIU" <gao.liu@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, October 18, 2008 2:59 PM
Subject: st: Brant test


Dear Statalist:

I tried to test the parallel slopes assumption of ordered logit regression using the brant command, and got an error message of "not all independent
variables can be retained in all binary logits, brant test cannot be
computed". Does anyone know what may be the reason? Thank you very much.

Best

Gao







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