【多选题】多重共线性的解决方法主要有()。
A. 保留重要的解释变量,去掉次要的或替代的解释变量
B. 利用先验信息改变参数的约束形式
C. 变换模型的形式
D. 综合使用时序数据与截面数据
E. 逐步回归法以及增加样本容量
What is the necessity of digital educational technology? ( )
A. Traditional classroom
B. Chalkboard
Chalk
D. Computers
What is the author’s attitudes towards the college life in the Internet age? ( )
A. Objective.
B. Supportive.
C. Neutral.
D. Indifferent.
What are the advantages of studying online in the dorm? ( )
A. Students are able to choose when and what you want to learn.
B. It is easy access to the wide range of online information.
C. There are more vivid teaching materials.
D. Teachers tend to dominate the class.
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