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Lay You Lum · 2021年02月21日

B选项中的除数和被除数写反了吧

* 问题详情,请 查看题干

NO.PZ201512020300000104

问题如下:

4. Where did the F-value in the ANOVA table come from?

选项:

A.

You look up the F-value in a table. The F depends on the numerator and denominator degrees of freedom.

B.

Divide the “Mean Square” for the regression by the “Mean Square” of the residuals.

C.

The F-value is equal to the reciprocal of the t-value for the slope coefficient.

解释:

B is correct.

This answer describes the calculation of the F-statistic.

B选项中的除数和被除数写反了吧?应该是Divide the “Mean Square” for the residuals by the “Mean Square” of the regression.吧

1 个答案

星星_品职助教 · 2021年02月22日

同学你好,

Divide是 (使)分开,分散,分割...的意思。

Divide A by B是“把A用B(by B)去分开的意思”,也就是A除以B。

在本题中,“Mean Square for the regression”为MSR,“Mean Square of the residuals"也就是“Mean Square of the errors”,即MSE。

所以B选项中的Divide the “Mean Square” for the regression by the “Mean Square” of the residuals 写成算式的形式就是:F-value=MSR/MSE。所以这个描述是正确的。

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Divide A by B 可以简单记忆为前除以后,也就是A除以B,A/B