Which statistical measures for 4 class classification?

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.