Waverley, use @ (instead of $) to extract the slots from the performance object (it's S4 class system).
HTH, Tobias On Sat, Jul 25, 2009 at 8:20 AM, Waverley<waverley.paloa...@gmail.com> wrote: > I use ROCR to plot multiple runs' performance. Using the sample code > as example: > > # plot ROC curves for several cross-validation runs (dotted > # in grey), overlaid by the vertical average curve and boxplots > # showing the vertical spread around the average. > data(ROCR.xval) > pred <- prediction(ROCR.xval$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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
