McNemar Statistic

Problem

Return the McNemar statistic (b - c)^2 / (b + c) for a paired 2x2 table, where b and c are the two discordant cell counts. Return 0.0 when b + c is zero.

Hint

Only the off-diagonal cells matter.

Test cases

case 1

in: [10,2]

expected: 5.333333333333333

case 2

in: [5,5]

expected: 0

case 3

in: [0,5]

expected: 5

case 4

in: [0,0]

expected: 0

case 5

in: [20,8]

expected: 5.142857142857143

Starter codePython

def mcnemar_statistic(b, c):
    # Your code here
    pass

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