Sometimes, we can’t measure what we need, so we invent a proxy, something that’s much easier to measure and stands in as an approximation. TV advertisers, for example, could never tell which viewers would be impacted by an ad, so instead, they measured how many people saw

Sometimes, we can’t measure what we need, so we invent a proxy, something that’s much easier to measure and stands in as an approximation. TV advertisers, for example, could never tell which viewers would be impacted by an ad, so instead, they measured how many people saw

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