David Winsemius wrote:
On Jan 22, 2010, at 3:53 AM, Na'im R. Tyson wrote:
Dear R-philes,
I am plotting ROC curves for several cross-validation runs of a
classifier (using the function below). In addition to the average
AUC, I am interested in obtaining a confidence interval for the
average AUC. Is there a straightforward way to do this via the ROCR
package?
You should probably contact the authors. When I tried using that package
a few weeks ago, several of the annotation features were broken. I
contacted the author who said there had been problems after converting
to S4 method. He also said there would be a fix but not immediately.
There has been a release since that time and I tried it, but it did not
appear to fix the problems I encountered. All I was able to get were
very simple ROC curves without any confidence intervals or marking of
levels. I ended up turning to the Epi package for what I needed ( but I
did not need confidence intervals so cannot comment on that aspect.)
I'm wondering what was broken with the S3 implementation that made them
change to S4.
Frank
--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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