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Re: st: RE: stcrreg and Harrell's c index


From   Andrzej Niemierko <aniemierko@PARTNERS.ORG>
To   Stata <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: stcrreg and Harrell's c index
Date   Wed, 30 Sep 2009 18:16:54 -0400

Roger,
I am getting "option censtat() not allowed" message. Should it be
-cenind()-, maybe? Also, by -hazard- you mean subhazard ratio or cumulative
subhazard function?
Andrzej





On 9/11/09 5:40 PM, "Newson, Roger B" <r.newson@imperial.ac.uk> wrote:

> I don't know why Harrell's c is not available afert parametric survival model.
> However, it is definitely available after the -somersd- command, downloadable
> from SSC. If in Stata you type
> 
> somersd lifetime hazard, censtat(cstat) transf(c) tdist
> 
> and -lifetime- is a lifetime variable, -hazard- is a predictor of hazard rate,
> and -cstat- is a censorship status variable (positive for right-censored
> lifetimes, negative for left-censored lifetimes and zero for uncensored
> lifetimes), then you will get an estimate for Harrell's c, which is stored in
> e(b).
> 
> I hope this helps. Let me know if you have any further queries.
> 
> Best wishes
> 
> Roger
> 
> 
> Roger B Newson BSc MSc DPhil
> Lecturer in Medical Statistics
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute
> Imperial College London
> Royal Brompton Campus
> Room 33, Emmanuel Kaye Building
> 1B Manresa Road
> London SW3 6LR
> UNITED KINGDOM
> Tel: +44 (0)20 7352 8121 ext 3381
> Fax: +44 (0)20 7351 8322
> Email: r.newson@imperial.ac.uk
> Web page: http://www.imperial.ac.uk/nhli/r.newson/
> Departmental Web page:
> http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgeneti
> cs/reph/
> 
> Opinions expressed are those of the author, not of the institution.
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Andrzej Niemierko
> Sent: 11 September 2009 14:46
> To: Stata
> Subject: st: stcrreg and Harrell's c index
> 
> Harrell's c index is not available as a postestimation statistic after
> stcrreg (or any parametric survival model). Is there a theoretical reason
> for this? If not, how can I compute it after stcrreg?
> Andrzej
> 
> 
> 
> 
> 
> 
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