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黄路迦 · 2022年12月08日

如下

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NO.PZ202208220100000302

问题如下:

Identify the type of error and its impacts on regression Model A indicated by the data in Exhibit 2.

选项:

A.Serial correlation, invalid coefficient estimates, and deflated standard errors. B.Heteroskedasticity, valid coefficient estimates, and deflated standard errors. C.Serial correlation, valid coefficient estimates, and inflated standard errors.

解释:

A is correct. The Breusch–Godfrey (BG) test is for serial correlation, and for Model A, the BG test statistic exceeds the critical value. In the presence of serial correlation, if the independent variable is a lagged value of the dependent variable,then regression coefficient estimates are invalid and coefficients’ standard errors are deflated, so t-statistics are inflated.

coefficients’ standard errors are deflated,为什么

1 个答案

星星_品职助教 · 2022年12月09日

同学你好,

实际看不出是inflated还是deflated,根据题干信息只能确认有serial correlation,但不知道方向。

根据排除法,只能选择A。

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