A Multiple Testing Approach to the Regularisation of Large Sample Correlation Matrices
Natalia Bailey (),
M Pesaran () and
L. Vanessa Smith
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L. Vanessa Smith: University of York
No 764, Working Papers from Queen Mary University of London, School of Economics and Finance
This paper proposes a regularisation method for the estimation of large covariance matrices that uses insights from the multiple testing (MT) literature. The approach tests the statistical significance of individual pair-wise correlations and sets to zero those elements that are not statistically significant, taking account of the multiple testing nature of the problem. By using the inverse of the normal distribution at a predetermined significance level, it circumvents the challenge of estimating the theoretical constant arising in the rate of convergence of existing thresholding estimators, and hence it is easy to implement and does not require cross-validation. The MT estimator of the sample correlation matrix is shown to be consistent in the spectral and Frobenius norms, and in terms of support recovery, so long as the true covariance matrix is sparse. The performance of the proposed MT estimator is compared to a number of other estimators in the literature using Monte Carlo experiments. It is shown that the MT estimator performs well and tends to outperform the other estimators, particularly when the cross section dimension, N, is larger than the time series dimension, T.
Keywords: Sparse correlation matrices; High-dimensional data; Multiple testing; Thresholding; Shrinkage (search for similar items in EconPapers)
JEL-codes: C13 C58 (search for similar items in EconPapers)
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Journal Article: A multiple testing approach to the regularisation of large sample correlation matrices (2019)
Working Paper: A Multiple Testing Approach to the Regularisation of Large Sample Correlation Matrices (2015)
Working Paper: A multiple testing approach to the regularisation of large sample correlation matrices (2014)
Working Paper: A Multiple Testing Approach to the Regularisation of Large Sample Correlation Matrices (2014)
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