[R] Evaluating the Yield of Medical Tests

Frank E Harrell Jr f.harrell at vanderbilt.edu
Tue Jul 20 13:52:20 CEST 2004

Marc Schwartz <MSchwartz at MedAnalytics.com> is correct.  The rcorr.cens 
function in the Hmisc package was written to do what is described in 
that article.  It also computes standard errors, and there is a function 
rcorrp.cens that in paired predictions can assess whether one predictor 
is "more concordant" with survival time than the other.  In the binary Y 
case rcorr.cens gives you the ordinary Somers Dxy and standard error, 
translatable to ROC area.

Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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