Sensitivity and Specificity from Counts

Problem

Return [sensitivity, specificity] from counts: sensitivity = tp / (tp + fn) and specificity = tn / (tn + fp). Return 0.0 for a ratio whose denominator is zero.

Hint

Each measure is a conditional proportion in one row of the confusion matrix.

Test cases

case 1

in: [90,10,80,20]

expected: [0.9,0.8]

case 2

in: [50,0,50,0]

expected: [1,1]

case 3

in: [0,10,20,0]

expected: [0,1]

case 4

in: [0,0,0,0]

expected: [0,0]

case 5

in: [40,10,45,5]

expected: [0.8,0.9]

Starter codePython

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

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