相关二项模型的相关结构与隐含违约分布
Correlation Structures of Correlated Binomial Models and Implied Default Distribution
摘要:
我们展示了如何分析和解释的相关结构,条件期望值和相关系数的可交换伯努利随机变量。我们研究了iTraxx-CJ债券的隐含违约分布和一些流行的概率模型,包括高斯copula模型,贝塔二项式分布模型和长期伊辛模型。我们解释的相关结构方面的差异,他们的配置文件。隐含违约分布具有奇异的相关结构,反映了信贷市场的含义。我们指出两个可能的起源的奇异行为。
英文摘要:
We show how to analyze and interpret the correlation structures, the conditional expectation values and correlation coefficients of exchangeable Bernoulli random variables. We study implied default distributions for the iTraxx-CJ tranches and some popular probabilistic models, including the Gaussian copula model, Beta binomial distribution model and long-range Ising model. We interpret the differences in their profiles in terms of the correlation structures. The implied default distribution has singular correlation structures, reflecting the credit market implications. We point out two possible origins of the singular behavior.
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