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The Key to Multivariate Testing
The key of multivariate testing is you can assess the interaction impact between these two variables so again like going back to my example of neck now let's say search bar. The more versions you have the more variation your traffic is split out more and the sticks longer to get a good read on the test which is where you can get enough confidence that this is significant from a statistics point of view. Another technique I've used it once which is called bandit testing and the concept there is now unlike ab testing where you do some analysis to know you need to run the test for four weeks then decide what the winner is.