MDE calculator flask web app MDE calculator helps you to understand the smallest improvement you’re willing to be able to detect on your data before A/B-experiment started more about it: https://www.evanmiller.org/how-not-to-run-an-ab-test.html https://blog.twitter.com/engineering/en_us/a/2016/power-minimal-detectable-effect-and-bucket-size-estimation-in-ab-tests