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You Can’t Spell CUPED Without Frisch-Waugh-Lovell
https://www.evanmiller.org/you-cant-spell-cuped-without-frisch-waugh-lovell.html
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A/B tests run faster with CUPED. Here I explain the underlying math, and use it to invent an even better variance-reduction technique for online experiments: You Can’t Spell CUPED Without Frisch-Waugh-Lovell
