[R] Interpreting the example given by Prof Frank Harrell in {Design} validate.cph

[Frank Harrell]

Vikky,

You'll notice that the model containing sex in addition to age has a higher
apparent Dxy as you would expect [R^2 is not higher because it captures only
the age effect].  The validated Dxy's may be as they are because of the very
low number of bootstrap resamples (10) that you used.

Please following the posting guide, i.e., include a simple self-reproducing
script that I can run - one that simulates its own dataset.

Please switch to the rms package is this is the one that is being fully
supported.  See http://biostat.mc.vanderbilt.edu/Rrms.

Frank


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Frank Harrell
Department of Biostatistics, Vanderbilt University
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