Youden Index

Problem

Return the Youden index sensitivity + specificity - 1 for a diagnostic cutoff. It ranges from -1 to 1 and is 0 for an uninformative test.

Hint

Add the two rates and subtract one.

case 1

in: [0.9,0.8]

expected: 0.7000000000000002

case 2

in: [1,1]

expected: 1

case 3

in: [0.5,0.5]

expected: 0

case 4

in: [0,0]

expected: -1

case 5

in: [0.8,0.9]

expected: 0.7000000000000002

Starter codePython

def youden_index(sensitivity, specificity):
    # Your code here
    pass

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