Multiple ROC curves in one plot ROCR

Question

Is it possible to plot the roc curve for diffrent classifiers in the same plot using the ROCR package? I\'ve tried:

>plot(perf.neuralNet, colorize=TRUE)
>li         


        

Answer 1

Echoing @adibender, and adding a comment: the example doesn't cover how to set separate colors for each individual curve using the second (plot all at once) approach. In this case, pass col as a list:

library(ROCR)
data(ROCR.hiv)
x   <- prediction(ROCR.hiv$hiv.nn$predictions, ROCR.hiv$hiv.nn$labels)
ROC <- performance(x, "tpr", "fpr")
plot(ROC, col = as.list(1:10))