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I had a statistics course at MIT where the professor would bring up one of the solutions to this problem at least once a week for the entire semester:

http://en.wikipedia.org/wiki/Bonferroni_correction



That would be a solution to using pairwise statistics to come up with an answer to an A/B/C/D test. That is not a solution to the challenge of evaluating an A/B test at multiple time points.




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