Efficient Risk Simulations for Linear Asset Portfolios in the t-Copula Model

Halis Sak, Wolfgang Hörmann, Josef Leydold

Publikation: Wissenschaftliche FachzeitschriftOriginalbeitrag in FachzeitschriftBegutachtung


We consider the problem of calcu-lating tail probabilities of the
returns of linear asset portfolios. As a flexible and accurate model for the logarithmic returns we use the t-copula dependence structure and marginals following the generalized hyperbolic distribution. Exact calcu- lation of the tail-loss probabilities is not possible and even simulation leads to challenging numerical problems. Applying a new numerical inversion method for the generation of the marginals and importance sampling with carefully selected mean shift we develop an efficient simulation algorithm. Numerical results for a variety of realistic portfolio examples show an impressive performance gain.
DOI 10.1016/j.ejor.2009.06.025
Seiten (von - bis)802 - 809
FachzeitschriftEuropean Journal of Operational Research (EJOR)
PublikationsstatusVeröffentlicht - 1 Dez. 2010