Tutorial: How to establish quality and correctness of classification models? Part 3 – Confusion Matrix

Confusion Matrix is an N x N matrix, in which rows correspond to correct decision classes and the columns to decisions made by the classifier. The number ni,j at the intersection of i-th row and j-th column is equal to the number of cases from the i-th class which have been classified as belonging to the j-th class.

In the previous parts of the tutorial (