A reach curve estimates the number of unique people that see an advertisement as a function of the number of advertising impressions that are purchased on an advertising network. An exponential mechanism approach can be used to compute an estimate of a reach function for a given set of publisher data in a differentially private manner.
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Clegg, Matthew, "Using the Exponential Mechanism to Compute Differentially Private Reach Curves", Technical Disclosure Commons, (March 02, 2022)