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A comment on What do we really know about the effectiveness of digital advertising?. Parent comment

Re:What do we really know about the effectiveness of digital... by nerfhammer on Wednesday November 06, 2019 @06:38PM (#21468804)
That's what conversion lift studies are for. Deliberately don't show ads to a holdout group of eligible users, and measure the difference.

e.g., https://www.facebook.com/business/help/688346554927374

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