Using Bernstein bases, the Bezier mechanism estimates variance and covariance under add-remove differential privacy with optimal mean squared error 2/(epsilon^2 n^2) in the high-privacy regime.
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Optimal Variance and Covariance Estimation under Differential Privacy in the Add-Remove Model and Beyond
Using Bernstein bases, the Bezier mechanism estimates variance and covariance under add-remove differential privacy with optimal mean squared error 2/(epsilon^2 n^2) in the high-privacy regime.