MediumStatisticsst-004

Pearson Correlation

Problem

Compute the Pearson correlation coefficient between x and y:

r = cov(x, y) / (std(x) * std(y))

Return 0.0 if either standard deviation is 0.

Hint

Covariance divided by the product of standard deviations. Range: [-1, 1].

case 1

in: [[1,2,3,4],[2,4,6,8]]

expected: 1

case 2

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

expected: -1

case 3

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

expected: 0.5

case 4

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

expected: 0

Starter codePython

def pearson_correlation(x, y):
    # Your code here
    pass

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