A/B test findings

What large testing programs report about A/B tests, and how to read your own results without fooling yourself.

10–20%of Bing ideas succeeded

Most A/B tests lose: what large testing programs report

Before you trust a test on your store, look at what happened to the people who ran thousands of them.

5×the false positive rate can rise if you keep peeking

The dashboard says “95% chance to win” on day three. Published research says that if you stop there, the number cannot be trusted.

Every app has a free plan.