Why Spotify Is Not Using Bayesian A/B Testing

Over the last few years there has been great interest in Bayesian inference for A/B testing, and many commercial experimentation platforms now offer Bayesian A/B testing.  , , , , , , , and , all ship a Bayesian mode. The main argument is that it is modern, flexible and easier to interpret compared to frequentist statistics. In addition, it is often claimed that many of the frequentist complexities like multiple testing and sequential testing fall out naturally in the Bayesian way of thinking. In this blog post, we argue that there is a theme of oversimplification that frequently leads to bad inference practice that is no better than peeking in frequentist statistics. In statistics, details matter.

Source: https://engineering.atspotify.com/2026/9/why-spotify-is-not-using-bayesian-a-b-testing. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.