Hello Makis, 2018-07-20 23:44 GMT+09:00 Andreas Mueller <t3k...@gmail.com>:
> There is no single roc curve for a 3 class problem. So what do you want to > plot? > > On 07/20/2018 10:40 AM, serafim loukas wrote: > > What I want to do is to plot the average(mean) ROC across Folds for a > 3-class case. > > The prototypical ROC curve uses True Positive Rate and False Positive Rate for its axes, so it is for 2-class problems, and not for 3+-class problems, as Andy mentioned. Perhaps you are wanting the mean and confidence intervals of the n-class Cohen Kappa metric as estimated by either many folds of cross validation, or you want to evaluate your classifier by repeated subsampling experiments and Kappa value distribution/histogram? Hope this helps, J.B.
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