Ye sorry of course i'm interested to the area ranging from 0;0 to 0.4;0.8 thank you Guido
2013/5/27 Uwe Ligges <lig...@statistik.tu-dortmund.de> > > > On 27.05.2013 16:18, Guido Leoni wrote: > >> Dear list >> I'm testing a predictor and I produced nice performance plots with ROCR >> package utilizing the 3 standard command >> >> pred <- prediction(predictions, labels) >> perf <- performance(pred, measure = "tpr", x.measure = "fpr") >> plot(perf, col=rainbow(10)) >> >> The pred object and the perfo object are S4 >> with the following slots >> >> An object of class "performance" >> Slot "x.name": >> [1] "False positive rate" >> >> Slot "y.name": >> [1] "True positive rate" >> >> Slot "alpha.name": >> [1] "Cutoff" >> >> Slot "x.values": >> [[1]] >> [1] 0.00 0.00 0.05 0.10 0.10 0.10 0.10 0.10 0.15 0.15 0.15 0.20 0.25 >> 0.25 >> 0.25 0.25 0.25 0.30 0.35 0.35 0.35 0.40 0.40 0.45 0.50 0.50 0.55 0.55 0.60 >> [30] 0.65 0.65 0.70 0.70 0.75 0.80 0.85 0.90 0.90 0.95 1.00 1.00 >> >> >> Slot "y.values": >> [[1]] >> [1] 0.00 0.05 0.05 0.05 0.10 0.15 0.20 0.25 0.25 0.30 0.35 0.35 0.35 >> 0.40 >> 0.45 0.50 0.55 0.55 0.55 0.60 0.65 0.65 0.70 0.70 0.70 0.75 0.75 0.80 0.80 >> [30] 0.80 0.85 0.85 0.90 0.90 0.90 0.90 0.90 0.95 0.95 0.95 1.00 >> >> >> Slot "alpha.values": >> [[1]] >> [1] Inf 33309 32968 31688 31648 31355 31122 31047 30777 30589 30460 >> 30395 30305 30159 29841 29101 28734 28657 28393 28196 27740 27662 27373 >> 27078 >> [25] 26763 26303 25573 25416 25364 25357 24993 23834 23789 23616 22357 >> 20669 20092 18720 18136 17323 16665 >> >> >> Now i'd like to make a plot (and also compute the AUC) only of the area >> corresponding to 0.80 y.values and 0.40 x.values. >> According to your experience is it possible to subset the perf object to >> the afore mentioned values? >> > > But x=0.4 and y=0.8 is just a point, so I don't get which plot and area > you are talking about now? > > Best, > UWe Ligges > > > > > > > Thanks >> Guido >> >> [[alternative HTML version deleted]] >> >> ______________________________**________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help> >> PLEASE do read the posting guide http://www.R-project.org/** >> posting-guide.html <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.
