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IreneZz · 2021年10月03日

Assuming that the expected daily return is 0

NO.PZ2020033001000032

问题如下:

Suppose an investment manager manages an investment portfolio with two assets, of which asset A is $ 2 million and asset B is $ 3 million. The correlation between the two assets is 0.2, and the standard deviations of the daily returns of assets A and B are 2% and 1%, respectively. Assuming that the expected daily return is 0, at a 95% confidence level (α = 1.645), what is the 10-day risk value (VaR) of the portfolio?

选项:

A.

$65800

B.

$49350

C.

$89800

D.

$283972

解释:

D is correct.

考点:组合VaR的计算

解析:首先资产A和B的daily VaR分别是:

A:2million*2%*1.645=65800

B:3million*1%*1.645=49350

他们两个组合的daily var就等于(65800^2+49350^2+2*0.2*65800*49350)^0.5=89800

那么10天的var就等于89800*SQRT(10) 得到283972

想问一下这个题目里面的Assuming that the expected daily return is 0 这句话有起到什么作用吗?如果不是0还能这么做吗?

1 个答案
已采纳答案

李坏_品职助教 · 2021年10月04日

嗨,从没放弃的小努力你好:


如果不是0的话,需要先算出组合的μ(expected daily return),再算出组合的σ,然后利用公式var=μ - 1.645*σ 来求出组合的VaR。


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