Column Standard Deviation

Problem

Compute the sample standard deviation (denominator n - 1) of each column of data.

Return the standard deviations in column order as floats. Assume at least two samples.

Hint

A zero-variance column has standard deviation 0.0.

case 1

in: [[[1,2],[3,4],[5,6]]]

expected: [2,2]

case 2

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

expected: [1,1]

case 3

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

expected: [0.7071067811865476,0.7071067811865476]

case 4

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

expected: [0,0]

Starter codePython

def column_std(data):
    # Your code here
    pass

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