Discrete Versus Continuous State Switching Models for Portfolio Credit Risk

Tinbergen Institute Discussion Paper No. 2003-075/2

14 Pages Posted: 28 Oct 2003

See all articles by Pieter Klaassen

Pieter Klaassen

UBS AG

Andre Lucas

Vrije Universiteit Amsterdam - School of Business and Economics; Tinbergen Institute

Date Written: September 30, 2003

Abstract

Dynamic models for credit rating transitions are important ingredients for dynamic credit risk analyses. We compare the properties of two such models that have recently been put forward. The models mainly differ in their treatment of systematic risk, which can be modeled either using discrete states (e.g., expansion versus recession) or continuous states. It turns out that the implied asset correlations for discrete state switching models are implausibly low compared to correlation estimates in the literature. Given these limited correlations, we conclude that care has to be taken when discrete state regime switching models are employed for dynamic credit risk management. As a side result of our analysis, we obtain indirect evidence that default correlations may change over the business cycle.

Keywords: credit risk, regime switching, latent variable models, factor models

JEL Classification: G21, C22, C53

Suggested Citation

Klaassen, Pieter and Lucas, Andre, Discrete Versus Continuous State Switching Models for Portfolio Credit Risk (September 30, 2003). Tinbergen Institute Discussion Paper No. 2003-075/2, Available at SSRN: https://ssrn.com/abstract=455080 or http://dx.doi.org/10.2139/ssrn.455080

Pieter Klaassen

UBS AG ( email )

Postfach
Zurich, 8076
Switzerland

Andre Lucas (Contact Author)

Vrije Universiteit Amsterdam - School of Business and Economics ( email )

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Netherlands
+31 20 598 6039 (Phone)
+31 20 598 6020 (Fax)

HOME PAGE: http://personal.vu.nl/a.lucas

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