Likelihood Ratio Statistic

Problem

Return the likelihood ratio statistic 2*(log_lik_full - log_lik_reduced). The statistic is non-negative when the full model contains the reduced model.

Hint

The statistic compares maximized log-likelihoods.

Test cases

case 1

in: [-100,-110]

expected: 20

case 2

in: [-50,-50]

expected: 0

case 3

in: [-10,-12]

expected: 4

case 4

in: [-180,-200]

expected: 40

case 5

in: [-5,-6]

expected: 2

Starter codePython

def likelihood_ratio_statistic(ll_full, ll_reduced):
    # Your code here
    pass

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