Tag Archives: sample size

20-80% Faster A/B Tests? Is it real?

Percent Runs and Stopping Stage 1Delta

I got a question today about our AGILE A/B testing calculator and the statistics behind it and realized that I’m yet to write a dedicated post explaining the efficiency gains from using the method in more detail. This despite the fact that these speed gains are clearly communicated and verified through simulation results presented in our AGILE […] Read More…

Posted in A/B Testing, AGILE A/B Testing, Statistics | Also tagged , , , , , , , | Leave a comment

Multivariate Testing – Best Practices & Tools for MVT (A/B/n) Tests

Multivariate AB Tests / MVT Testing

Let’s get this out of the way from the very beginning: most “A/B tests” are in fact multivariate (MVT) tests, a.k.a. A/B/n tests. That is, most of the time when you read about “A/B testing” the term also encompasses multivariate testing. The only reason to specifically differentiate between A/B and MVT is when someone wants to […] Read More…

Posted in A/B Testing, AGILE A/B Testing, Multiple Variations Testing, Statistical Significance, Statistics | Also tagged , , , , | Leave a comment

The Importance of Statistical Power in Online A/B Testing

Statistical Power and Test Sensitivity

What is Statistical Power? In null-hypothesis statistical testing (NHST) – the procedure most commonly applied in A/B tests, there are two types of errors that practitioners should care about, type I and type II errors. Type I is the probability of the test procedure to falsely reject a true null hypothesis. Type II error is […] Read More…

Posted in A/B Testing, AGILE A/B Testing, Conversion Optimization, Statistical Significance, Statistics | Also tagged , , , , | Leave a comment