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Amy_ywh · 2023年11月13日

我可以就用s/n(-0.5）来算么？得到了相似的数值

  1. CFA I
  2. Quantitative

NO.PZ2021071601000001

问题如下：

Otema Chi has a spreadsheet with 108 monthly returns for shares in Marunou Corporation. He writes a software program that uses bootstrap resampling to create 200 resamples of this Marunou data by sampling with replacement. Each resample has 108 data points. Chi’s program calculates the mean of each of the 200 resamples, and then it calculates that the mean of these 200 resample means is 0.0261. The program subtracts 0.0261 from each of the 200 resample means, squares each of these 200 differences, and adds the squared differences together. The result is 0.835. The program then calculates an estimate of the standard error of the sample mean.

选项：

A.

0.0115

B.

0.0648

C.

0.0883

解释：

谢谢

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1 个答案

星星_品职助教 · 2023年11月13日

同学你好，

不行的。对于这种有明确公式的题目，必须按照具体公式来计算。

本题三个选项差距比较大，但如果遇到差距细微的选项，用别的公式就可能出现错误。

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NO.PZ2021071601000001问题如下 Otema Chi ha spreaheet with 108monthly returns for shares in Marunou Corporation. He writes a softwareprogrthuses bootstrresampling to create 200 resamples of this Marunouta sampling with replacement. Earesample h108 ta points. Chi’sprogrcalculates the meof eaof the 200 resamples, anthen itcalculates ththe meof these 200 resample means is 0.0261. The programsubtracts 0.0261 from eaof the 200 resample means, squares eaof these 200fferences, anas the squarefferences together. The result is 0.835.The progrthen calculates estimate of the stanrerror of the samplemean. A.0.0115B.0.0648C.0.0883 ​ it calculates ththe meof these 200 resample means is 0.0261. The progrsubtracts 0.0261 from eaof the 200 resample means,

2023-11-10 09:15 1 · 回答

NO.PZ2021071601000001 问题如下 Otema Chi ha spreaheet with 108monthly returns for shares in Marunou Corporation. He writes a softwareprogrthuses bootstrresampling to create 200 resamples of this Marunouta sampling with replacement. Earesample h108 ta points. Chi’sprogrcalculates the meof eaof the 200 resamples, anthen itcalculates ththe meof these 200 resample means is 0.0261. The programsubtracts 0.0261 from eaof the 200 resample means, squares eaof these 200fferences, anas the squarefferences together. The result is 0.835.The progrthen calculates estimate of the stanrerror of the samplemean. A.0.0115 B.0.0648 C.0.0883 老师，我不理解为什么再抽样的样本按照200-1计算，而不是108-1呢？

2022-06-05 16:18 1 · 回答

NO.PZ2021071601000001 Otema Chi ha spreaheet with 108 monthly returns for shares in Marunou Corporation. He writes a software progrthuses bootstrresampling to create 200 resamples of this Marunou ta sampling with replacement. Earesample h108 ta points.  他一共就有108个样本，然后他每次重复抽样的量都是108，那不就把全部都抽了么

2022-03-02 23:01 1 · 回答

NO.PZ2021071601000001 这题考的是什么呢？

2021-11-14 22:27 1 · 回答