Tutorials for drawing an ROC curve

Are there tutorials you recommend that teach how to draw an ROC curve?

Thanks.

-
I think you need to be more precise. Do you want to draw them by hand (don't), or use a specific piece of software (R, SPSS, ...)? What exactly is your problem with drawing them? –  Nick Sabbe Aug 8 '11 at 13:59
See my answer to your previous question -- I think it is a pretty straightforward description of ROC. –  mbq Aug 8 '11 at 14:28
The most important thing to learn is WHEN to draw ROC curves. 95% of the examples that I have seen are unnecessary and do not represent the best approach to the problem. –  Frank Harrell Aug 9 '11 at 13:21
@Nick Sabbe. Since I'm trying to learn how to plot an ROCcurve, a tutorial to show you the steps and how it is built would be fine, but I will surely use a software for that. Thanks –  Simplicity Aug 10 '11 at 15:54