Responsiveness Index

Problem

Return Guyatt's responsiveness index mean(followup - baseline) / sd(followup - baseline), using the sample standard deviation of the change scores. Return 0.0 when fewer than two pairs are given, lengths differ, or the change scores are constant.

Hint

It standardizes the observed change by its own variability.

Test cases

case 1

in: [[50,60,70],[55,68,75]]

expected: 3.464101615137755

case 2

in: [[10,12,14],[10,12,14]]

expected: 0

case 3

in: [[1,2,3],[2,4,6]]

expected: 2

case 4

in: [[5,5],[7,7]]

expected: 0

case 5

in: [[1],[2]]

expected: 0

Starter codePython

def responsiveness_index(baseline, followup):
    # Your code here
    pass

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