计量经济学(四版)习题及详细答案详细版 下载本文

内容发布更新时间 : 2024/12/22 12:10:47星期一 下面是文章的全部内容请认真阅读。

个人收集整理 勿做商业用途

表中r12=0.896,r13=0.895,说明施肥量与有效灌溉面积和播种面积间高度相关. 我们可以通过对变量X2地变换来消除多重共线性.令X22=X2/X3(公斤/亩),这样就大大降低了施肥量与面积之间地相关性,用变量X22代替X2,对模型重新回归,结果如下:文档收集自网络,仅用于个人学习 =-233.62 + 0.088X1 + 13.66*X2 + 0.096X3 - 0.099X4 R2=0.91文档收集自网络,仅用于个人学习 t: (-3.10) (2.48) (3.91) (4.77) (-3.19)文档收集自网络,仅用于个人学习 从回归结果地t值可以看出,现在各个变量都已通过显著性检验,说明多重共线性问题基本得到解决.

个人收集整理 勿做商业用途

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个人收集整理 勿做商业用途

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