Odds Ratio from Cell Counts

Problem

The sample odds ratio for a 2x2 table is (a * d) / (b * c) with a, b the exposed outcomes and c, d the unexposed outcomes.

Given the four counts, return the odds ratio.

Hint

Cross-multiply the diagonal cells.

case 1

in: [10,90,5,95]

expected: 2.111111111111111

case 2

in: [20,30,20,30]

expected: 1

case 3

in: [15,5,5,15]

expected: 9

Starter codePython

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

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