Deriving the Dependence Structure of Portfolio Credit Derivatives Using Evolutionary Algorithms

8 Pages Posted: 23 Mar 2006

See all articles by Svenja Hager

Svenja Hager

University of Tuebingen - Faculty of Economics and Business Administration

Rainer Schoebel

University of Tuebingen - Faculty of Economics and Social Sciences

Date Written: February 2006

Abstract

Even if the correct modeling of default dependence is essential for the valuation of portfolio credit derivatives, for the pricing of synthetic CDOs a one-factor Gaussian copula model with constant and equal pairwise correlations for all assets in the reference portfolio has become the standard market model. If this model were a reflection of market opinion, there wouldn't be the implied correlation smile that is observed in the market. The purpose of this paper is to derive a correlation structure from observed CDO tranche spreads. The correlation structure is chosen such that all tranche spreads of the traded CDO can be reproduced. This implied correlation structure can then be used to price off-market tranches with the same underlying as the traded CDO. Using this approach we can significantly reduce the risk to misprice off-market derivatives. Due to the complexity of the optimization problem we apply Evolutionary Algorithms.

Keywords: credit risk, CDOs, Evolutionary Algorithms

JEL Classification: G13, C61

Suggested Citation

Hager, Svenja and Schoebel, Rainer, Deriving the Dependence Structure of Portfolio Credit Derivatives Using Evolutionary Algorithms (February 2006). Available at SSRN: https://ssrn.com/abstract=893049 or http://dx.doi.org/10.2139/ssrn.893049

Svenja Hager (Contact Author)

University of Tuebingen - Faculty of Economics and Business Administration ( email )

Mohlstrasse 36
D-72074 Tuebingen, 72074
Germany

Rainer Schoebel

University of Tuebingen - Faculty of Economics and Social Sciences ( email )

Mohlstrasse 36
D-72074 Tuebingen
Germany
+49 7071 2977088 (Phone)

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