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Sallyrrr · 2024年02月27日

可以解释一下pooled estimator吗

NO.PZ2018062016000141

问题如下:

Which of the following statements on a pooled estimator most appropriate?

选项:

A.

It's an equality of the variances of two normally distributed populations.

B.

It's an estimate drawn from the combination of two different samples.

C.

It's only be used in t-test.

解释:

B is correct. A pooled estimate is an estimate drawn from the combination of two different samples. It's used when testing the concerning difference between means.

谢谢

1 个答案

品职助教_七七 · 2024年02月28日

嗨,努力学习的PZer你好:


 pooled estimator是均值之差的t检验中,检验统计量公式里的共同方差,如下:

通过pooled estimator的公式即可看出,里面既有源自sample 1中的s1,也有sample 2中的s2。B选项的描述是正确的。

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