[R] Receiver Operator Characteristic curve
Frank E Harrell Jr
feh3k at spamcop.net
Thu Mar 11 23:48:51 CET 2004
On Thu, 11 Mar 2004 13:16:15 -0500
XIAO LIU <xiaoliu at jhmi.edu> wrote:
> Dear R-helpers:
> I want to calculate area under a Receiver Operator Characteristic curve.
> Where can I find related functions?
> Thank you in advance
w <- somers2(predicted probability, 0/1 diagnosis)
Convert Somers' Dxy rank correlation to ROC area (C) using Dxy=2*(C-.5).
To get standard error of Dxy (and hence C) type ?rcorr.cens (another Hmisc
This is the nonparametric Wilcoxon-Mann-Whitney approach.
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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