20 lines of code that beat A/B testing every time
<img src="http://research.microsoft.com/en-us/projects/bandits/MAB-2.jpg"/> A/B testing is used far too often, for something that performs so badly. It is defective by design: Segment users into two groups. Show the A group the old, tried and true stuff. Show the B group the new whiz-bang design with the bigger…