I am using ROCR package and I was wondering how can one plot a ROC curve for
knn model in R? Is there any way to plot it all with this package?
I don't know how to use the prediction function of
knn. Here's my example, i am using isolet dataset from UCI repository where i renamed the class attribute as y:
cl <- factor(isolet_training$y) knn_isolet <- knn(isolet_training, isolet_testing, cl, k=2, prob=TRUE)
Now my question is, what are the arguments to pass to the prediction function of ROC. I tried the 2 below alternatives which are not working:
library(ROCR) pred_knn <- prediction(knn_isolet$y, cl) pred_knn <- prediction(knn_isolet$y, isolet_testing$y)