Hi Waverley, I forgot to tell you that "perf" is your performance object. Here is an example from the ROCR package: ## computing a simple ROC curve (x-axis: fpr, y-axis: tpr) library(ROCR) data(ROCR.simple) pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels) perf <- performance(pred,"tpr","fpr")
# y.values unlist(slot(perf,"y.values")) HTH, Jorge > On Sat, Feb 7, 2009 at 3:17 PM, Waverley <waverley.paloa...@gmail.com>wrote: > >> Hi, >> >> I have a question about ROCR package. I got the ROC curve plotted >> without any problem following the manual. However, I don't know to >> extract the values, e.g. y.values ( I think it is the area under the >> curve auc measure). The return is an object of class "performance" >> which have Slots and one of the slot is "y.values". I type the object >> and I can see them in screen. But I want to extract the value for >> further programming and computation. I did a summary of the object >> and it is a "S4" mode which I don't understand. >> >> Can someone help? >> >> Thanks a lot in advance. >> >> -- >> 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. >> > > [[alternative HTML version deleted]] ______________________________________________ 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.
