Large dimensional analysis and optimization of robust shrinkage covariance matrix estimators - Archive ouverte HAL Access content directly
Journal Articles Journal of Multivariate Analysis Year : 2014

Large dimensional analysis and optimization of robust shrinkage covariance matrix estimators

(1, 2) , (3)
1
2
3

Abstract

This article studies two regularized robust estimators of scatter matrices pro-posed in parallel in (Chen et al., 2011) and (Pascal et al., 2013), based on Tyler's robust M-estimator (Tyler, 1987) and on Ledoit and Wolf's shrinkage covariance matrix estimator (Ledoit and Wolf, 2004). These hybrid estimators have the advantage of conveying (i) robustness to outliers or impulsive samples and (ii) small sample size adequacy to the classical sample covariance matrix estimator. We consider here the case of i.i.d. elliptical zero mean samples in the regime where both sample and population sizes are large. We demonstrate that, under this setting, the estimators under study asymptotically behave similar to well-understood random matrix models. This characterization allows us to derive optimal shrinkage strategies to estimate the population scatter matrix, improv-ing significantly upon the empirical shrinkage method proposed in (Chen et al., 2011).
Fichier principal
Vignette du fichier
robust_hero.pdf (449.35 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01098854 , version 1 (29-12-2014)

Identifiers

Cite

Romain Couillet, Matthew Mckay. Large dimensional analysis and optimization of robust shrinkage covariance matrix estimators. Journal of Multivariate Analysis, 2014, 131, pp.99 - 120. ⟨10.1016/j.jmva.2014.06.018⟩. ⟨hal-01098854⟩
131 View
103 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More