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小爽加油呀 · 2023年08月07日

第四个

NO.PZ2020033001000048

问题如下:

Construct a Gaussian copula to estimate the joint default probability of two assets within a year. Regarding to this copula, which of the following statements are correct?

I.This copula uses a correlation matrix to define the relationship between variables.

II.This copula requires that the respective cumulative default probability are mapped to a bivariate standard normal distribution.

III.This type of copula is widely applied in finance.

IV.The N11(Q1(t))N_1^{-1}{(Q_1{(t)})} maps the individual asset cumulative default probability to standard normal.

选项:

A.

I and II

B.

II and III

C.

I, II and III

D.

II, III and IV

解释:

D is correct.

考点:copula function

解析:

表述1 错误:当只有两个资产时,此时只有一个相关系数 ρ,不需要相关系数矩阵(correlation matrix) 。

有两个资产,D中公式只是其中一个变成正态,为什么会是cumulative

1 个答案

pzqa27 · 2023年08月08日

嗨,努力学习的PZer你好:



题目问的是Gaussian copula的性质,Gaussian copula是用来把两种资产的累计违约概率分布联合在一起的。


看一下讲义的讲解,下图中的Mn指的是多元累计标准正态分布,M里面的每一个N^-1,分别都是一个标准正态分布的反函数,返回的值共同作为Mn这个外层函数的参数。对于一个单一资产来说,一个参数输入就足够得到累计分布值了。

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