[R] how to compute a roc curve

Frank E Harrell Jr f.harrell at vanderbilt.edu
Fri Oct 31 23:14:00 CET 2008

Pau Marc Munoz Torres wrote:
> Hi,
>  I'm trying to set up a prediction software, now i testing the performance
> of my method, so i need to calculate a ROC curve, specially auc, cut-off,
> sens and spec, i just looking at ROCH package, but it's a mass for me,  i'm
> not a math guy and I'm getting lost

The use of any cutoffs will result in inefficient and arbitrary 
analyses, and note that sensitivity and specificity are improper scoring 
rules (they are optimized by a bogus model).


> Could any of you recommend me an easy-to-use package to do this task? i just
> have a list of positive/negative samples and his score on my program. can I
> compute a roc curve with this?
> thanks
> pau
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Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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