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摇一摇 · 2023年07月30日

题目中 哪里能看出要开根号呢

NO.PZ2022123001000031

问题如下:

A fund had the following experience over the past 10 years:


The target semideviation of the returns over the 10 years if the target is 2% is closest to:

选项:

A.

1.42%

B.

1.50%

C.

2.01%

解释:


The target semi-deviation is the square root of the sum of the squared deviations from the target, divided by n − 1:


题目中 哪里能看出要开根号呢

2 个答案

星星_品职助教 · 2023年07月31日

@摇一摇

半标准差的表述方法为target semi-deviation,或target downside deviation。

半方差的表述方式为target semivariance。

星星_品职助教 · 2023年07月31日

同学你好,

本题要计算的是“target semi-deviation”,这个词的意思是半标准差。

半标准差即需要对计算出来的半方差(target semivariance)开根号。

摇一摇 · 2023年07月31日

Semi standard deviation是半标准差,semi-deviation也是标准差的意思啊

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