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线性回归中非多重共线性假定与解决方案(3)

2013-12-18 MedSci MedSci原创

5. 逐步分析法 <span style="; &quot;">&nbsp;&nbsp;&nbsp;&nbsp;当模型中存在多重共线性时,可以用逐步分析法剔除那些引起多重共线性的,不重要的解释变量从而消除多重共线性。 逐步分析法的步骤是,首先估计被解释变量对每一个解释变量的回归方程,然后依据显著性检验确定出对因变量贡献最大的解释变量所对应的回归方程,并以它为基础,逐个引入其余解释变量

5. 逐步分析法     当模型中存在多重共线性时,可以用逐步分析法剔除那些引起多重共线性的,不重要的解释变量从而消除多重共线性。 逐步分析法的步骤是,首先估计被解释变量对每一个解释变量的回归方程,然后依据显著性检验确定出对因变量贡献最大的解释变量所对应的回归方程,并以它为基础,逐个引入其余解释变量重新回归,并按以下原则决定新引入解释变量的保留与剔除。 (1)若新引入的解释变量对回归方程的可决系数R2有明显改进,且回归系数的t检验在统计上是显著的,那么该解释变量在模型中予以保留。 (2)若新引入的解释变量未能明显地改进可决系数R2,且对其它回归系数的检验没有什么影响,则认为该解释变量是多余的,应该剔除。 (3)若引入的解释变量不仅改变了可决系数R2,而且还影响其它回归系数估计值的数值甚至符号,以至某些回归系数达到不能接受的地步,说明出现了多重共线性。找出与其相关的解释变量,保留两个中对因变量贡献大的哪个,剔除影响小的那一个。 例7.3  表7.3给出天津市1974-1987年粮食销售量yt(万吨/年),常住人口数xt1(万人),人均收

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    2014-03-12 heelboy

    非常好,值得推荐

    0

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