Cliff's Delta

Problem

Return Cliff's delta, the difference in the proportions of favorable pairwise comparisons: (#(x > y) - #(x < y))/(n1*n2). Return 0.0 if either sample is empty.

Hint

It is the nonparametric effect size between -1 and 1.

Test cases

case 1

in: [[1,2,3],[4,5,6]]

expected: -1

case 2

in: [[4,5,6],[1,2,3]]

expected: 1

case 3

in: [[1,2,3],[1,2,3]]

expected: 0

case 4

in: [[1,2,3],[2,2,4]]

expected: -0.3333333333333333

case 5

in: [[1,2],[1,2]]

expected: 0

Starter codePython

def cliffs_delta(x, y):
    # Your code here
    pass

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