Heteroscedasticity Ratio

Problem

Split data into two halves at n//2 and return the ratio max(var1, var2) / min(var1, var2) of the population variances. Return 0.0 when n < 4 or the smaller variance is zero.

Hint

The ratio is 1 for equal spread and grows with unequal spread.

Test cases

case 1

in: [[1,2,1,10,20,10]]

expected: 99.99999999999999

case 2

in: [[1,2,3,10,20,30]]

expected: 100.00000000000001

case 3

in: [[5,5,5,5]]

expected: 0

case 4

in: [[1,3,1,5,7,5]]

expected: 1

case 5

in: [[2,4,2,4]]

expected: 1

Starter codePython

def heteroscedasticity_ratio(data):
    # Your code here
    pass

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