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

[Frank Harrell]

I think it should be the negative of the first Dxy but this is all why the
posting guide says to create the simplest self-defined example that shows
the problem.  That way I could run it and get to the bottom of this.  See
the help file for cph which has examples of simulating test data.  Try to
have only two covariates.
Frank

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Frank Harrell
Department of Biostatistics, Vanderbilt University
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