Papers › Differentially Private Covariance Revisited
Differentially Private Covariance Revisited
Wei Dong, Yuting Liang, Ke Yi
In this paper, we present two new algorithms for covariance estimation under concentrated differential privacy (zCDP). The first algorithm achieves a Frobenius error of Õ(d^(1/4)√(tr)/√(n) + √(d)/n), where tr is the trace of the covariance matrix. By taking tr=1, this also implies a worst-case error bound of Õ(d^(1/4)/√(n)), which improves the standard Gaussian mechanism's Õ(d/n) for the regime d>Ω(n^(2/3)). Our second algorithm offers a tail-sensitive bound that could be much better on skewed data. The corresponding algorithms are also simple and efficient. Experimental results show that they offer significant improvements over prior work.
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