- Volume 20, Number 3 (2014), 1029-1058.
High-dimensional covariance matrix estimation with missing observations
In this paper, we study the problem of high-dimensional covariance matrix estimation with missing observations. We propose a simple procedure computationally tractable in high-dimension and that does not require imputation of the missing data. We establish non-asymptotic sparsity oracle inequalities for the estimation of the covariance matrix involving the Frobenius and the spectral norms which are valid for any setting of the sample size, probability of a missing observation and the dimensionality of the covariance matrix. We further establish minimax lower bounds showing that our rates are minimax optimal up to a logarithmic factor.
Bernoulli, Volume 20, Number 3 (2014), 1029-1058.
First available in Project Euclid: 11 June 2014
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Lounici, Karim. High-dimensional covariance matrix estimation with missing observations. Bernoulli 20 (2014), no. 3, 1029--1058. doi:10.3150/12-BEJ487. https://projecteuclid.org/euclid.bj/1402488933