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December 2011 High-dimensional covariance matrix estimation in approximate factor models
Jianqing Fan, Yuan Liao, Martina Mincheva
Ann. Statist. 39(6): 3320-3356 (December 2011). DOI: 10.1214/11-AOS944

Abstract

The variance–covariance matrix plays a central role in the inferential theories of high-dimensional factor models in finance and economics. Popular regularization methods of directly exploiting sparsity are not directly applicable to many financial problems. Classical methods of estimating the covariance matrices are based on the strict factor models, assuming independent idiosyncratic components. This assumption, however, is restrictive in practical applications. By assuming sparse error covariance matrix, we allow the presence of the cross-sectional correlation even after taking out common factors, and it enables us to combine the merits of both methods. We estimate the sparse covariance using the adaptive thresholding technique as in Cai and Liu [J. Amer. Statist. Assoc. 106 (2011) 672–684], taking into account the fact that direct observations of the idiosyncratic components are unavailable. The impact of high dimensionality on the covariance matrix estimation based on the factor structure is then studied.

Citation

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Jianqing Fan. Yuan Liao. Martina Mincheva. "High-dimensional covariance matrix estimation in approximate factor models." Ann. Statist. 39 (6) 3320 - 3356, December 2011. https://doi.org/10.1214/11-AOS944

Information

Published: December 2011
First available in Project Euclid: 5 March 2012

zbMATH: 1246.62151
MathSciNet: MR3012410
Digital Object Identifier: 10.1214/11-AOS944

Subjects:
Primary: 62H25
Secondary: 62F12, 62H12

Rights: Copyright © 2011 Institute of Mathematical Statistics

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Vol.39 • No. 6 • December 2011
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