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stephyten · 2019年02月08日

问一道题:NO.PZ2016071602000011

问题如下图:

    

选项:

A.

B.

C.

D.

解释:


理解答案里的解题思路,但还想问下,CVAR的定义就是how portfolio VAR would change approximately if the component was deleted from the portfolio,为什么这里又不能用呢?什么时候才能用CVAR呢?感谢!

1 个答案

品职答疑小助手雍 · 2019年02月08日

同学你好,你是想问为什么Mvar*头寸(100)为什么不能用么?

Mvar*100这种算法其实算是估算了,并不精确,而这题中cvar最精确的算法就是直接拿总的减去P1单独的。

至于什么时候能用什么时候不能用,虽然不能一概而论,不过主要看题目给出的已知条件,给出来和整体的相关系数的之类的时候用那个公式多一些。

KellyBai · 2019年05月06日

所以这题如果没有给individual VAR,选C也是可以的?

品职答疑小助手雍 · 2019年05月06日

是这样的,但是这种情况应该不会很常见。

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