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RE: st: c-statistic in Cox models

From   "Newson, Roger B" <>
To   <>
Subject   RE: st: c-statistic in Cox models
Date   Sun, 8 Oct 2006 14:08:46 +0100

The -somersd- package, downloadable from SSC using the -ssc- command,,
also calculates general Harrell c-indices, and also Somers' D and
Kendall's tau-a. There is an example in the manual -somersd.pdf-, which
is distributed with the package as an ancillary file.

I hope this helps.


Roger Newson
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
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322

Opinions expressed are those of the author, not of the institution.

-----Original Message-----
[] On Behalf Of Jacki Buros
Sent: 08 October 2006 02:29
Subject: Re: st: c-statistic in Cox models

Hi Ashwin,

Try the stcox postestimation command -estat concordance-, which
calculates Harrell's C. This may be what you want for the survival
analysis, so long as you do not have time-varying covariate effects.

I don't know whether there is a similar command for svy regress.


On 10/7/06, Ashwin Ananthakrishnan <> wrote:
> Hi,
> Is there a command in stata where I can calculate the
> c-statistic for predictive models in Cox regression
> survival analysis?
> I tried the stcstat program that I found online but
> that doesn't seem to be working. Are there other
> commands?
> Is there a similar c-statistic command for use in
> survey analysis also? (following a .svylogit or a
> .svyregress command) ?
> Thanks.
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