Sparse PCA-based on high-dimensional Ito processes with measurement errors

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This paper investigates the eigenspace estimation problem for the large integrated volatility matrix based on non-synchronized and noisy observations from a high-dimensional Ito process. We establish a minimax lower bound for the eigenspace estimation problem and propose sparse principal subspace estimation methods by using the multi-scale realized volatility matrix estimator or the pre-averaging realized volatility matrix estimator. We derive convergence rates of the proposed eigenspace estimators and show that the estimators can achieve the minimax lower bound, and thus are rate-optimal. The minimax lower bound can be established by Fano's lemma with an appropriately constructed subclass that has independent but not identically distributed normal random variables with zero mean and heterogeneous variances. (C) 2016 Elsevier Inc. All rights reserved.
Publisher
ELSEVIER INC
Issue Date
2016-12
Language
English
Article Type
Article
Keywords

VOLATILITY MATRIX ESTIMATION; PRINCIPAL COMPONENT ANALYSIS; FREQUENCY FINANCIAL DATA; QUADRATIC COVARIATION; MICROSTRUCTURE NOISE; DIFFUSION-PROCESSES; CONSISTENCY; RATES

Citation

JOURNAL OF MULTIVARIATE ANALYSIS, v.152, pp.172 - 189

ISSN
0047-259X
DOI
10.1016/j.jmva.2016.08.006
URI
http://hdl.handle.net/10203/225850
Appears in Collection
MT-Journal Papers(저널논문)
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