Goodman-Kruskal Gamma

Problem

Return Goodman and Kruskal's gamma (P - Q)/(P + Q) for a 2D table, where P counts concordant pairs and Q discordant pairs, each cell pair weighted by its counts. Return 0.0 when there is no concordant or discordant pair.

Hint

Gamma ignores ties entirely and ranges from -1 to 1.

Test cases

case 1

in: [[[10,20],[30,40]]]

expected: -0.2

case 2

in: [[[30,10],[10,30]]]

expected: 0.8

case 3

in: [[[5,5],[5,5]]]

expected: 0

case 4

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

expected: -0.6153846153846154

case 5

in: [[[10,20,30]]]

expected: 0

Starter codePython

def goodman_kruskal_gamma(observed):
    # Your code here
    pass

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