MediumStatisticsst-229

Chi-Square/df and RMSEA

Problem

Return [chi2/df, rmsea] with rmsea = sqrt(max(chi2 - df, 0)/(df*(n-1))). Return [0.0, 0.0] when df <= 0 or n <= 1.

Hint

RMSEA rewards parsimony because it divides by the degrees of freedom.

case 1

in: [30,10,200]

expected: [3,0.1002509414234171]

case 2

in: [5,10,100]

expected: [0.5,0]

case 3

in: [60,20,500]

expected: [3,0.06330889378329184]

case 4

in: [0,5,100]

expected: [0,0]

case 5

in: [30,0,100]

expected: [0,0]

Starter codePython

def chi2_rmsea(chi2, df, n):
    # Your code here
    pass

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