题目内容

Find the degrees of freedom in a regression model that has 10 observations and 7 independent variables.

A. 17
B. 2
C. 3
D. 4

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(Requires Calculus) In the multiple regression model you estimate the effect on Yi of a unit change in one of the Xi while holding all other regressors constant. This

A. makes little sense, because in the real world all other variables change.
B. corresponds to the economic principle of mutatis mutandis.
C. leaves the formula for the coefficient in the single explanatory variable case unaffected.
D. corresponds to taking a partial derivative in mathematics.

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In multiple regression, the R2 increases whenever a regressor is

A. added unless the coefficient on the added regressor is exactly zero.
B. added.
C. added unless there is heterosckedasticity.
D. greater than 1.96 in absolute value.

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The coefficient of determination (R2) decreases when an independent variable is added to a multiple regression model.

A. 对
B. 错

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进口货物滞报金的起算日期为运输工具申报进境之日起第（）天。邮运货物滞报金的起算日期为收货人接到邮局通知之日起第（）天。转关运输货物滞报金的起算日期有两个，一是运输工具申报进境之日起第（）天，二是货物运抵指运地之日起第（）天。

A. 15、15、14、14
B. 15、14、15、14
C. 14、14、15、15
D. 15、15、15、15

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Find the degrees of freedom in a regression model that has 10 observations and 7 independent variables.

A. 17 B. 2 C. 3 D. 4

(Requires Calculus) In the multiple regression model you estimate the effect on Yi of a unit change in one of the Xi while holding all other regressors constant. This

In multiple regression, the R2 increases whenever a regressor is

The coefficient of determination (R2) decreases when an independent variable is added to a multiple regression model.

A. 17
B. 2
C. 3
D. 4