Improving Portfolios Global Performance with Robust Covariance Matrix Estimation: Application to the Maximum Variety Portfolio

Emmanuelle Jay (1) , Eugénie Terreaux (2) , Jean-Philippe Ovarlez (3) , Frederic Pascal (4, 5)

1 ENSEA - Ecole Nationale Supérieure de l'Electronique et de ses Applications
2 SONDRA - Sondra, CentraleSupélec, Université Paris-Saclay (COmUE)
3 ONERA - The French Aerospace Lab [Palaiseau]
4 L2S - Laboratoire des signaux et systèmes
5 CentraleSupélec

This paper presents how the most recent improvements made on covariance matrix estimation and model order selection can be applied to the portfolio optimisation problem. The particular case of the Maximum Variety Portfolio is treated but the same improvements apply also in the other optimisation problems such as the Minimum Variance Portfolio. We assume that the most important information (or the latent factors) are embedded in correlated Elliptical Symmetric noise extending classical Gaussian assumptions. We propose here to focus on a recent method of model order selection allowing to efficiently estimate the subspace of main factors describing the market. This non-standard model order selection problem is solved through Random Matrix Theory and robust covariance matrix estimation. The proposed procedure will be explained through synthetic data and be applied and compared with standard techniques on real market data showing promising improvements.

Keywords: Robust Covariance Matrix Estimation; Model Order Selection; Random Matrix Theory; Portfolio Optimisation; Financial Time Series; Multi-Factor Model; Elliptical Symmetric Noise; Maximum Variety Portfolio

Domains: Engineering Sciences [physics]

Emmanuelle Jay, Eugénie Terreaux, Jean-Philippe Ovarlez, Frederic Pascal. Improving Portfolios Global Performance with Robust Covariance Matrix Estimation: Application to the Maximum Variety Portfolio. 26th European Signal Processing Conference (EUSIPCO), Sep 2018, Rome, Italy. ⟨10.23919/eusipco.2018.8553414⟩. ⟨hal-02124639⟩