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R: st: Re: Brant test


From   "Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   R: st: Re: Brant test
Date   Sat, 18 Oct 2008 16:19:22 +0200


Dear Gao,
In addition to Martin's useful hints, I would recommend you to visit Prof.
Richard Williams' website at http://www.nd.edu/~rwilliam.

Sorry I cannot be more helpful.
Kind Regards and enjoy your W-E,
Carlo

-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Gao LIU
Inviato: sabato 18 ottobre 2008 15.25
A: statalist@hsphsun2.harvard.edu
Oggetto: RE: st: Re: Brant test

The results are similar, but not the same. What might cause the difference?

Gao



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
Sent: Saturday, October 18, 2008 9:17 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Re: Brant test

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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