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Introduction Have you ever run an A/B test and needed to change cohort allocations in the middle of the experiment? If so, you might have observed some surprising results when analyzing your metrics. Changing cohort allocation can make experiment analysis tricky and even lead to false conclusions if one is not careful. In this blog post, we show what can go wrong and offer solutions. At Yelp, we are constantly iterating on our products to make them more useful and engaging for our customers. In ...