Relative Risk from Counts

Problem

For a 2x2 table with cells a, b (exposed: events, nonevents) and c, d (unexposed), the relative risk is (a / (a + b)) / (c / (c + d)).

Given the four counts, return the relative risk.

Hint

Compare the two event rates.

case 1

in: [10,90,5,95]

expected: 2

case 2

in: [20,30,20,30]

expected: 1

case 3

in: [1,9,2,8]

expected: 0.5

Starter codePython

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

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