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st: R: C-statistic with -gologit2-


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: R: C-statistic with -gologit2-
Date   Wed, 7 Oct 2009 10:44:36 +0200

Dear Sara,
googling using: c-statistic; c-statistic AND Stata; give me the following
results:

http://symptomresearch.nih.gov/chapter_8/sec7/cess7pg11.htm

http://hesperia.gsfc.nasa.gov/~schmahl/c-statistic/node1.html

http://n2.nabble.com/st-harrell-C-statistics-comparison-td3582088.html.

However, when it comes to c-statistic and gologit2, three relevant Statalist
contributors come to my mind (their Web page address between brackets):

Maarten Buis (http://www.maartenbuis.nl)
Roger Newson (http://www.imperial.ac.uk/nhli/r.newson/)
Richard Williams (http://www.nd.edu/~rwilliam).

You may want to search their Web pages for the solution to your query or
they hopefully come across your posting and reply you directly detailing the
trick you need.

Sorry I cannot be more helpful.

Kind Regards,
Carlo

-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di
s.muller@cphc.keele.ac.uk
Inviato: mercoledì 7 ottobre 2009 10.07
A: statalist@hsphsun2.harvard.edu
Oggetto: st: C-statistic with -gologit2-

Hi,

I have checked the archives and I can't find anything on this topic (sorry
if I have missed the answer to my question), but hopefully someone can
help me.

I have fitted a partial proportional odds model using -gologit2- in Stata
9.2 (3 levels of the outcome, 14 predictors). I used the -autofit- option
to assess proportionality and 2 of my predictors have non-proportional
odds.

Reviewers have suggested the use of a generalized c-statstic to assess the
internal validity of the model. I am struggling to work out how I might
get the value from Stata.

Please could someone give me a pointer in the right direction?

Best wishes,
Sara

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