Re: Hey,

[Frank E Harrell Jr <f.harrell@vanderbilt.edu>]

Alex Asiimwe wrote:
> Hey,
> I ve used Cox regression to develop a model for prediction. However, I
> would also want to calculate the AUC or ROC. How do I go about? Its is
> easy when using logistic regression but I am using Cox regression.
> Thanks
> Alex
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In the Design library see the documentation for validate.cph, and in the 
Hmisc library see the rcorr.cens function.   Generalized ROC area C and 
Somers' Dxy rank correlation are related by Dxy=2(C-.5).
--
Frank E Harrell Jr   Professor and Chair           School of Medicine
                     Department of Biostatistics   Vanderbilt University