Yule's Q

Problem

Return Yule's Q = (a*d - b*c) / (a*d + b*c) for a 2x2 table. Return 0.0 when the denominator is zero.

Hint

Q is a symmetric measure of 2x2 association ranging from -1 to 1.

case 1

in: [10,20,30,40]

expected: -0.2

case 2

in: [10,0,0,10]

expected: 1

case 3

in: [5,5,5,5]

expected: 0

case 4

in: [1,2,3,4]

expected: -0.2

case 5

in: [1,0,1,0]

expected: 0

Starter codePython

def yules_q(a, b, c, d):
    # Your code here
    pass

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