[Compute AUC of a ROC Function]

Hi all,

I'm working to a classifier in which are presente 3 classes.

Now, I can plot ROC function through this:

figure, plotroc(targets,outputs)
h=gcf;
set(h, prop, valori);
print(h, '-dpdf', '-r300', strcat(folder_name,'\Roc.pdf'));
close all;

I would like to compute the AUC of this picture, Can you help me?

Thanks

Enrico

Answer 1

[Ilya]

If you have Statistics Toolbox, the perfcurve function can compute AUC.

You mention that you have 3 classes. I am guessing this means you get 3 ROC curves. You can then compute 3 AUC values, one per curve.

[Enrico]

Thanks for your answer. Can you explain why matlab plots an only one ROC curve, with: plotroc(..) ?

Thanks

[Ilya]

No, I cannot. I have no idea what your data looks like, and I do not really know what plotroc function you are using.

Answer 2

[Misha]

I am having the same query of how to compute AUC of ROC curve plotted with plotROC function. If u got the answer can u please help me with the same.