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rmhamei · 2023年12月08日

A选项和C选项,看不懂,是什么意思,可以翻译一下吗

NO.PZ2023060502000010

问题如下:

Analysts performing bootstrap:

选项:

A.

seek to create statistical inferences of population parameters from a single

sample.

B.

repeatedly draw samples of the same size, with replacement, from the original

population.

C.

must specify probability distributions for key risk factors that drive the

underlying random variables.

解释:

A is correct. Bootstrapping through random sampling generates the observed

variable from a random sampling with unknown population parameters. The analyst

does not know the true population distribution, but through sampling can

infer the population parameters from the randomly generated sample. B is incorrect

because, when performing bootstrap, the analyst repeatedly draws samples

from the original sample and not population, where each individual resample has

the same size as the original sample and each item drawn is replaced for the next

draw. C is incorrect because, when performing bootstrap, analysts simply use the

observed empirical distribution of the underlying variables. In a Monte Carlo

simulation, in contrast, the analyst would specify probability distributions for key

risk factors that drive the underlying variables.

A选项和C选项,看不懂,是什么意思,可以翻译一下吗

1 个答案

品职助教_七七 · 2023年12月08日

嗨,努力学习的PZer你好:


A选项:bootstrap是从一个单一样本中得到关于总体参数的统计推断。

由于bootstrap是resample的一种,也就是从一个样本中(a single sample)再重复抽样来估计总体,所以这个描述是正确的。


C选项:bootstrap必须对于随机变量的风险因子设定分布。

bootstrap里并没有这一条要求。这个选项是偷换概念。需要对于risk factor设定分布的是Monte Carlo Simulation。

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努力的时光都是限量版,加油!

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