Re: [R] Question about subsetting S4 object in ROCR
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-helphttps://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.
Re: [R] Question about subsetting S4 object in ROCR
You can access the data directly by using something like perf@x.values[[1]]. Not sure if that helps you. The package pROC allows you to do partial areas under the curve by selecting a range of specificity or sensitivity that you're interested in. On Tue, May 28, 2013 at 2:17 AM, Guido Leoni guido.le...@gmail.com wrote: 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. [[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.
Re: [R] Question about subsetting S4 object in ROCR
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 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.
