(as others have mentioned) Optimizely's newer engine uses ideas like Wald's sequential analysis. Here is my article on the topic: http://www.win-vector.com/blo

(as others have mentioned) Optimizely's newer engine uses ideas like Wald's sequential analysis. Here is my article on the topic: http://www.win-vector.com/blog/2015/12/walds-sequential-analysis-technique/ http://www.win-vector.com/blog/2015/12/walds-sequential-anal... .