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蛋黄也酥酥 · 2022年05月21日

如果这道题问的是百分比

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NO.PZ201809170400000604

问题如下:

Based on Exhibit 1, the contribution of Asset 2 to Manager C’s portfolio variance is closest to:

选项:

A.

0.0025.

B.

0.0056.

C.

0.0088.

解释:

B is correct. The contribution of an asset to total portfolio variance equals the summation of the multiplication between the weight of the asset whose contribution is being measured, the weight of each asset (xj), and the covariance between the asset being measured and each asset (Cij), as follows:

Contribution of each asset to portfolio variance = CVi

=j=1nXjXiCi,j={\textstyle\sum_{j=1}^n}X_jX_iC_{i,j}

The contribution of Asset 2 to portfolio variance is computed as the sum of the following products:

分母应该怎么算?列一个3*3的表格然后把所有框里的相加吗

1 个答案

笛子_品职助教 · 2022年05月21日

嗨,从没放弃的小努力你好:


分母就是portfolio的方差,一般会已知。但是这题无需计算分母。


如果要计算分母的话:用以下公式。也就是同学所理解的,3*3的表格然后把所有框里的相加。


这是基础讲义248-249页例题的改写,老师推荐3*3的表格




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