On Thu, 11 Mar 2004 13:16:15 -0500
XIAO LIU <[EMAIL PROTECTED]> 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
>
> Xiao
>
install.packages('Hmisc')
library(Hmisc)
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
function).
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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