R help - Aug 2010 - confidence intervals for Harrell's c-index in survival setting

Dear All,

Is it possible to get confidence intervals for Harrell's concordance index
or, equivalently, Somer's D using the rms package or in some other way ?
I have survival data it would be the c-index in the Cox model setting

Many thanks




Dr Bernard North
Statistical Consultant
Statistical Advisory Service
Advice and Courses on Research Design and Methodology
Imperial College South Kensington Campus
8 Princes Gardens Room 845, 4th Floor

London SW7 1NA.

Tel: 020 7594 2034
Fax: 020 7594 1489
Email: bnorth@imperial.ac.uk<mailto:bnorth@imperial.ac.uk>
Web:  www.ic.ac.uk/stathelp<http://www.ic.ac.uk/stathelp>


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On Aug 17, 2010, at 6:10 AM, North, Bernard V wrote:
> Dear All,
>
> Is it possible to get confidence intervals for Harrell's concordance  
> index or, equivalently, Somer's D using the rms package or in some  
> other way ?
> I have survival data it would be the c-index in the Cox model setting
I believe that Frank has answered this question several times on the  
list. Have you done a search of the r-help archives?

-- 
David.
>
> Many thanks
>
>
>
>
> Dr Bernard North
> Statistical Consultant
> Statistical Advisory Service
> Advice and Courses on Research Design and Methodology
> Imperial College South Kensington Campus
> 8 Princes Gardens Room 845, 4th Floor
>
> London SW7 1NA.
>
> Tel: 020 7594 2034
> Fax: 020 7594 1489
> Email: bnorth at imperial.ac.uk<mailto:bnorth at imperial.ac.uk>
> Web:  www.ic.ac.uk/stathelp<http://www.ic.ac.uk/stathelp>
>
>
> 	[[alternative HTML version deleted]]
>
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