Which statistical test tells which classifier performs better than the other? I have 3 classifiers: A, B and C. According to accuracy, specificity, sensitivity, f-score, and g-mean, say classifier B performs best. Now I want to statistically validate this claim. How should I do it? Will McNemar's test be enough to validate it? Which statistical test will tell me which classifier is better than the rest? And how?
Cochran's Q test

Is a generalisation of the McNemars test and can be used to see if there is a truly better classifier for the metric chosen. You can ofcourse also do pairwise Mcnemare test and draw conclusions from there.

NOTE:

These things are expensive