Matthews Correlation from Counts

Problem

The Matthews correlation coefficient is (TP TN - FP FN) / sqrt((TP + FP)(TP + FN)(TN + FP)(TN + FN)). Return 0.0 when any factor is zero.

Given the four counts, return the coefficient.

Hint

It stays high only when both classes are predicted well.

case 1

in: [8,9,1,2]

expected: 0.7035264706814485

case 2

in: [5,5,5,5]

expected: 0

case 3

in: [1,1,1,1]

expected: 0

Starter codePython

def matthews_correlation_coefficient(tp, tn, fp, fn):
    # Your code here
    pass

3 test cases · run your code against them in the editor