[R] ROCR package question

[Tobias Sing]

Waverley,

use @ (instead of $) to extract the slots from the performance object
(it's S4 class system).

HTH,
  Tobias

On Sat, Jul 25, 2009 at 8:20 AM, Waverley<waverley.paloalto at gmail.com> wrote:
> I use ROCR to plot multiple runs' performance.  Using the sample code
> as example:
>
> # plot ROC curves for several cross-validation runs (dotted
> # in grey), overlaid by the vertical average curve and boxplots
> # showing the vertical spread around the average.
> data(ROCR.xval)
> pred <- prediction(ROCR.xval$predictions, ROCR.xval$labels)
> perf <- performance(pred,"tpr","fpr")
> plot(perf,col="grey82",lty=3)
> plot(perf,lwd=3,avg="vertical",spread.estimate="boxplot",add=TRUE)
>
> I can follow the code and plot without any problem.  However, I don't
> know how to extract the averaged ROC area under curve value.
>
> Can someone help?
>
> Thanks.
>
> --
> Waverley @ Palo Alto
>
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