[R] Evaluating the Yield of Medical Tests

[Frank E Harrell Jr]

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