开发者:上海品职教育科技有限公司 隐私政策详情

应用版本:4.2.11(IOS)｜3.2.5(安卓)APP下载

返回

老马 · 2021年10月29日

b项为什么错了？

  1. CFA I
  2. Quantitative

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.

B也是对的啊，为什么错了

添加评论
2 个答案

袁园_品职助教 · 2022年06月05日

嗨，努力学习的PZer你好：


衡量离散程度的指标是Range，Range=最大值-最小值。Range A=31-（-39）=70；Range B=25-（-35）=60；Range C=11-（-8）=19。可以看处Stock C的range最小，B选项描述正确。Range这个指标不需要观察值是连续的，离散的也可以的

----------------------------------------------
努力的时光都是限量版，加油！

星星_品职助教 · 2021年10月30日

同学你好，

B的描述无误，计算出C的range确实三项中最小。

这道题要选择“ least accurate”

Viola欧拉 · 2022年06月03日

老师可以再进一步解释一下这里的Range是什么含义吗？就是指在2013-2017这个时间范围内的观察值吗？因为之前讲 Measures of dispersion 里面，Range我感觉是一个最大值减去最小值，而观察值应该是连续的，所以我第一个就排除了B，因为看起来这个选项是在混淆视听的。所以Range的用法和概念可以再解释一下吗？谢谢

  • 2

    回答

  • 0

    关注

  • 375

    浏览
相关问题

NO.PZ2018062016000051 问题如下 Having collectemereturns for the three stocks, the analyst is now concerneabout evaluating spersion.Whiof the following statements is least accurate? A.Baseon the variance,StoA hthe highest spersion. B.Baseon the range,StoC hthe lowest spersion. C.Baseon the meabsolute viation(MA,StoB hthe highest spersion. C is correct. MAA)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12MAB)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52MAC)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6Baseon the MAStoA hthe highest spersion.该题题目是要求least accurate，即最不正确的。所以选择 B里的rang求最大值最小值该怎么求？

2024-03-03 21:01 1 · 回答

NO.PZ2018062016000051问题如下 Having collectemereturns for the three stocks, the analyst is now concerneabout evaluating spersion.Whiof the following statements is least accurate?A.Baseon the variance,StoA hthe highest spersion.B.Baseon the range,StoC hthe lowest spersion.C.Baseon the meabsolute viation(MA,StoB hthe highest spersion. C is correct. MAA)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12MAB)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52MAC)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6Baseon the MAStoA hthe highest spersion.该题题目是要求least accurate，即最不正确的。所以选择如果遇到这种题，只能针对每个全部手算吗? 有没有更快的解题思路啊? 感觉手算特费时间。感觉一分多钟也算不完似的。 〈

2024-01-23 21:06 1 · 回答

NO.PZ2018062016000051 问题如下 Having collectemereturns for the three stocks, the analyst is now concerneabout evaluating spersion.Whiof the following statements is least accurate? A.Baseon the variance,StoA hthe highest spersion. B.Baseon the range,StoC hthe lowest spersion. C.Baseon the meabsolute viation(MA,StoB hthe highest spersion. C is correct. MAA)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12MAB)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52MAC)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6Baseon the MAStoA hthe highest spersion.该题题目是要求least accurate，即最不正确的。所以选择 请问，题目中给了stanrviation 和 mean, 那可以用CV来算spersion吗？因为得到的答案和M的答案是一样的，那用哪个一个最好？MACV的用法区别是什么呢？

2022-09-18 09:45 1 · 回答

NO.PZ2018062016000051问题如下Having collectemereturns for the three stocks, the analyst is now concerneabout evaluating spersion.Whiof the following statements is least accurate?A.Baseon the variance,StoA hthe highest spersion.B.Baseon the range,StoC hthe lowest spersion.C.Baseon the meabsolute viation(MA,StoB hthe highest spersion. C is correct. MAA)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12MAB)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52MAC)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6Baseon the MAStoA hthe highest spersion.该题题目是要求least accurate，即最不正确的。所以选择老师，请问这个题目算ma办法用计算器吗

2022-06-02 09:05 1 · 回答

NO.PZ2018062016000051 问题如下 Having collectemereturns for the three stocks, the analyst is now concerneabout evaluating spersion.Whiof the following statements is least accurate? A.Baseon the variance,StoA hthe highest spersion. B.Baseon the range,StoC hthe lowest spersion. C.Baseon the meabsolute viation(MA,StoB hthe highest spersion. C is correct. MAA)=(|-39-2.4|+|31-2.4|+|12-2.4|+|-4-2.4|+|12-2.4|)/5=19.12MAB)=(|-35-4.4|+|25-4.4|+|15-4.4|+|0-4.4|+|17-4.4|)/5=17.52MAC)=(|6-2|+|-8-2|+|11-2|+|-2-2|+|3-2|)/5=5.6Baseon the MAStoA hthe highest spersion.该题题目是要求least accurate，即最不正确的。所以选择 老师，可以讲一下stanrviation吗？好像没学到这个知识点

2022-05-14 17:08 2 · 回答