Association Confidence

Problem

Compute the confidence of the rule A -> B: (baskets containing both A and B) / (baskets containing A).

Return 0.0 if no basket contains A or input is empty.

Hint

Confidence is the conditional probability of B given A.

case 1

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"milk","eggs"]

expected: 0.3333333333333333

case 2

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"milk","milk"]

expected: 1

case 3

in: [[["milk","bread"],["milk"],["eggs","bread"],["milk","eggs"]],"none","milk"]

expected: 0

case 4

in: [[],"a","b"]

expected: 0

Starter codePython

def association_confidence(baskets, a, b):
    # Your code here
    pass

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