Systemic Risk Modeling with Lévy Copulas

Abstract

We investigate a systemic risk measure known as CoVaR that represents the value-at-risk (VaR) of a financial system conditional on an institution being under distress. For characterizing and estimating CoVaR, we use the copula approach and introduce the normal tempered stable (NTS) copula based on the Lévy process. We also propose a novel backtesting method for CoVaR by a joint distribution correction. We test the proposed NTS model on the daily S&P 500 index and Dow Jones index with in-sample and out-of-sample tests. The results show that the NTS copula outperforms traditional copulas in the accuracy of both tail dependence and marginal processes modeling.

Portfolio Optimization with Relative Tail Risk

“… See Adrian and Brunnermeier (2016),Huang and Uryasev (2018), andLiu et al (2021) for more details 3 In this paper, we consider the long-only portfolio.…”