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On Infectious Models for Dependent Default Risk

机译:相依违约风险的传染模型

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摘要

Modeling dependent defaults is a key issue in risk measurement and management. In this paper, we introduce a Markovian infectious model to describe the dependent relationship of default processes of credit entities. The key idea of the proposed model is based on the concept of common shocks adopted in the insurance industry. We compare the proposed model to both one-sector and two-sector models considered in the credit literature using real default data. A log-likelihood ratio test is applied to compare the goodness-of-fit of the proposed model. Our empirical results reveal that the proposed model outperforms both the one-sector and two-sector models.
机译:对依赖的违约进行建模是风险衡量和管理中的关键问题。在本文中,我们引入了一个马尔可夫传染模型来描述信用实体违约过程的依存关系。提出的模型的关键思想是基于保险业所采用的常见冲击的概念。我们使用真实的违约数据将提议的模型与信用文献中考虑的一部门和两部门模型进行了比较。对数似然比检验用于比较所提出模型的拟合优度。我们的经验结果表明,所提出的模型优于一部门和两部门模型。

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