[Compute AUC of a ROC Function]

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Enrico 2012-12-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/57166-compute-auc-of-a-roc-function

回答： Misha 2014-4-16

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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

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Answer 1

Ilya 2012-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/57166-compute-auc-of-a-roc-function#answer_69162

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.

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Enrico 2012-12-22

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

Thanks

Ilya 2012-12-22

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

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Answer 2

Misha 2014-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/57166-compute-auc-of-a-roc-function#answer_133576

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.

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