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Nicole Xiang · 2024年08月08日

怎么理解A选项的a singlesample?

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.

怎么理解A选项的a singlesample?

1 个答案

品职助教_七七 · 2024年08月08日

嗨,从没放弃的小努力你好:


这个地方的理解为:从总体中抽取一个样本(a single sample),以这个样本作为新总体。

此后从这个样本(新总体)中抽样,并据此做后续的统计推断。

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

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