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st: harrell C statistics comparison


From   Eduardo Nunez <enunezb@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: harrell C statistics comparison
Date   Fri, 4 Sep 2009 15:41:24 -0400

Dear Statalister,

A reviewer from a medical journal has asked me to provide 95% CI and
p-value for two nested Cox models of a Harrell C statistics
comparison.
Please help.

For instances,
Model1= stcox x y, efron
estat concordance=harrell1
Model2 stcox x y z, efron
estat concordance=harrell2

harrell2 - harrell1......xx, 95%CI(xx-yy); p=x.xx
or maybe harrel2/harrel1 (I am not sure which way)

Maybe boostraping the difference.

I would appreciate any help on this issue.

Eduardo

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