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st: question about the Brant test


From   "Christopher Parker" <parker@berkeley.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: question about the Brant test
Date   Mon, 17 Mar 2008 14:53:06 -0700 (PDT)

A little help with the brant test. I'm trying to determine whether or not
the proportional odds ratio is violated for an ordinal-level dependent
variable. However, after I estimate the ordered logit model, and type the
command for the brant test, I get an error message: y>:  operator invalid.

Can someone advise me on this?

Thanks.


> What exactly is the problem?
>
> ______________________________________________
> Kieran McCaul MPH PhD
> WA Centre for Health & Ageing (M573)
> University of Western Australia
> Level 6, Ainslie House
> 48 Murray St
> Perth 6000
> Phone: (08) 9224-2140
> Phone: -61-8-9224-2140
> email: kamccaul@meddent.uwa.edu.au
> http://myprofile.cos.com/mccaul
> _______________________________________________
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
> ncdcta00@uniroma2.it
> Sent: Sunday, 16 March 2008 3:44 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: stset and stsum problem
>
> Dear statlist,
> I have tried to set my data for a survival analysis, but I have a
> problem when use stset and put all the observations censored.
> My dataset is this:
> id  firstyearentry yearentry    yearexit    duration canvi
> 1      3/2001        3/2001       3/2002       12      0
> 1       3/2001      4/2002          9/2002       17     1
> 2       8/2002       8/2002         11/2002       3     0
> 2       8/2002       12/2002        5/2003        9     0
> 3 .....
> ...
>
> The command that I use is:
> stset dur, f(canvi==1) id(id)
> If I put all the observation censored and not with stsum I have this:
>   stsum;
>
>           failure _d:  canvi
>     analysis time _t:  dur
>                   id:  id
>
>           |               incidence       no. of    |------ Survival
> time -----|
>           | time at risk     rate        subjects        25%       50%
>        75%
> ---------+--------------------------------------------------------------
> -------
>     total |     10661543   .0002694         34301       1025         .
>          .
>
>
> If I  take only the observation with failure ==1 I have this:
>
>      failure _d:  canvi
>     analysis time _t:  dur
>                   id:  id
>
>           |               incidence       no. of    |------ Survival
> time -----|
>           | time at risk     rate        subjects        25%       50%
>        75%
> ---------+--------------------------------------------------------------
> -------
>     total |       960671   .0030687          2951        131       283
>        469
>
> Someone can help me to understand where is the error?
> Thanks in advance.
> best,
> catia
>
>
>
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