Which statistical measures for 4 class classification?

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Sepp
Sepp on 6 Jun 2015
Edited: Sepp on 7 Jun 2015
I have a classification task with 4 classes which I solve with machine learning classifiers (SVM etc.).
Which statistical measures can be used for 4 classes? I will for sure use p-value (with permutation test) but I need some more.
Some interesting measures are true positive rate, true negative rate, positive predictive value, negative predictive value, are under ROC curve, are under the PR curve.... But I think that this are all only for 2 classes.

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