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Re: st: question about the Brant test
At 04:53 PM 3/17/2008, Christopher Parker wrote:
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.
Hi Chris. First off, it is generally a bad idea to reply to another
message and change the topic. If you check the archives, you'll see
that your post (and now this one) are buried in the thread for the
earlier topic. And, if you do reply, it is an even worse idea to
keep all the old unrelated text in your message.
As for your current problem, it would help to see some output. One
possibility is that there is a mismatch between your version of
-spost- and your version of Stata. If you are using Stata 9 or 10
you want -spost9-, available from Scott Long's site (use -findit- to
get it). The ereturned results from ologit and oprobit changed a
version or two ago, and that can cause problems if you don't have the
right post-estimation software. Also, make sure you have the latest
versions of Stata and spost.
Of course, it could be something else entirely, but if so we'd need
to see the output. I myself have never had the problem you describe.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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