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飞天小猪77 · 2020年01月24日

问一道题:NO.PZ201512020300000801

* 问题详情,请 查看题干

问题如下:

Which of Vasileva’s assumptions regarding regression analysis is incorrect?

选项:

A.

Assumption 1

B.

Assumption 2

C.

Assumption 3

解释:

C is correct. The assumptions of the linear regression model are that the 1) the relationship between the dependent variable and the independent variable is linear in the parameters b0 and b1; 2) the independent variable is not random; 3) the expected value of the error term is 0; 4) the variance of the error term is the same for all observations; 5) the error term is uncorrelated across observations; and 6) the error term is normally distributed. Assumption 3 is incorrect because the expected value of the error term is assumed to be zero, not equal to the mean of the dependent variable.

assumption 2为什么正确,应该表述为constant and stable而不是same吧?谢谢

1 个答案

星星_品职助教 · 2020年02月03日

同学你好,

这两种表述都可以,同方差性质是方差需要相同(same/constant)。对于怎么定义“相同”,原版书并没有细说,所以二级考试里认为是same即可。