MediumStatisticsst-411

Brier Score Binary

Problem

The Brier score for binary probabilistic predictions is mean_i (p_i - y_i)^2.

Given the predicted probabilities and the binary outcomes, return the Brier score.

Hint

It is the mean squared error of probabilities.

case 1

in: [[0.8,0.2],[1,0]]

expected: 0.039999999999999994

case 2

in: [[0.5,0.5,0.5],[1,0,1]]

expected: 0.25

case 3

in: [[1,0],[1,0]]

expected: 0

Starter codePython

def brier_score_binary(probs, outcomes):
    # Your code here
    pass

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