I need to calculate cohen's d to determine the effect size of an experiment. Is there any implementation in a sound library I could use? If not, what would be a good implementation?
Since Python3.4, you can use the
statistics module for calculating spread and average metrics. With that, Cohen's d can be calculated easily:
from statistics import mean, stdev from math import sqrt # test conditions c0 = [2, 4, 7, 3, 7, 35, 8, 9] c1 = [i * 2 for i in c0] cohens_d = (mean(c0) - mean(c1)) / (sqrt((stdev(c0) ** 2 + stdev(c1) ** 2) / 2)) print(cohens_d)
So we observe a medium effect.