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by em441 4410 days ago
Hi! This is Emily, the stats brains behind this. I think this is a really interesting and important question. I know this question comes up in other contexts (clinical trials) and there has been a lot of work done on how to find "stopping times" from a statistical standpoint. I'd love to see some of these statistical methods for sequential analysis (developed for clinical trials) integrated into how we do A/B testing.