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yfmao · 2021年10月18日

考试会考计算这么多数字的mean absoulte deviation吗?手动计算量太大

NO.PZ2018062016000051

问题如下:

Having collected mean returns for the three stocks, the analyst is now concerned about evaluating dispersion.Which of the following statements is least accurate?

选项:

A.

Based on the variance,Stock A has the highest dispersion.

B.

Based on the range,Stock C has the lowest dispersion.

C.

Based on the mean absolute deviation(MAD),Stock B has the highest dispersion.

解释:

C is correct.

MAD(A)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12

MAD(B)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52

MAD(C)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6

Based on the MAD,Stock A has the highest dispersion.


考试会考计算这么多数字的mean absoulte deviation吗?手动计算量太大,没有什么捷径计算或者预估的方法吗

1 个答案

星星_品职助教 · 2021年10月18日

同学你好,

1)MAD的计算没有捷径;

2)考试的时候考这种计算量的可能性是有的,但不高;正常而言,如果有一道计算量很大的题,那么就会在某个地方出一道计算量非常小的题。

3)对于练习题而言,越复杂越有利于练习知识点。这道题是很好的练习MAD计算的题目。

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