Re: [R] obtaining a ROC curve

2005-11-28 Thread Vermeiren, Hans [VRCBE]
Hello, I have a classification tree. I want to obtain a ROC curve for this test. What is the easiest way to obtain one? -Anjali did you try the ROCR package ? regards, Hans Vermeiren __ R-help@stat.math.ethz.ch

Re: [R] obtaining a ROC curve

2005-11-28 Thread Tuszynski, Jaroslaw W.
See, my old post at http://finzi.psych.upenn.edu/R/Rhelp02a/archive/61879.html to see a list of ROC related packages and functions. One of them should work well for your application. All of them take data in the form: - x - real number value returned by the classifier - y - true labels /

Re: [R] obtaining a ROC curve

2005-11-27 Thread Frank E Harrell Jr
Anjali Karve wrote: Hello, I have a classification tree. I want to obtain a ROC curve for this test. What is the easiest way to obtain one? -Anjali ROC curves have a number of problems, chief among them leading to the temptation of dichotomizing test results. ROC areas are