Abel Elizalde () (CEMFI, Centro de Estudios Monetarios y Financieros)
Abstract
This report analyzes reduced-from credit risk models, and reviews the three main approaches to incorporate credit risk correlation among firms within the framework of reduced models. The first approach, conditionally independent defaults (CID) models, introduces credit risk dependence of the firms' default intensity processes on a common set of state variables. Contagion models extend the CID approach to account for default clustering (periods in which the firms's credit risk is increased and in which the majority of the defaults take place). Finally, default dependecies can also be accounted for using copula functions. The copula approach takes as given the marginal default probabilities of the different firms and plugs them into a copula function, which provides the model with the default dependece structure. After a description of copulas, we present two different approaches of using copula functions in intensity models, and discuss the choice and calibration of the copula function.
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Paper provided by CEMFI in its series Working Papers with number
wp2006_0605.
References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Houweling, P. & Vorst, A.C.F., 2002.
"An Empirical Comparison of Default Swap Pricing Models,"
Research Paper
ERS-2002-23-F&A Revision_, Erasmus Research Institute of Management (ERIM), ERIM is the joint research institute of the Rotterdam School of Management, Erasmus University and the Erasmus School of Economics (ESE) at Erasmus Uni.
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