计量问题求助

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如图所示，书中介绍将预测变量x5分成三组，成为离散型预测变量加入模型当中进行线性回归。然后根据分组创建了两个虚拟变量，最后回归结果出来后，下面的解释，middle那一组比不加虚拟变量的y值平均高15.2单位，high那一组比不加虚拟变量的y值低0.04个单位，请问这个15.2和0.04是怎么算出来的，没有看到，请老师们帮忙讲解一下，万分感谢~

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关键词：计量问题 Middle 两个虚拟变量 虚拟变量 回归结果 middle 如图所示 模型

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帖子不要沉啊，问题还没有得到解决

There are two possibilities that you get different outcomes from the author's; one is the author is wrong, second, your model specification is wrong. Where does this example come from (i.e., which book and page number)?

waterhorse 发表于 2016-8-30 00:54
There are two possibilities that you get different outcomes from the author's; one is the author is  ...

Master Data Analysis With R, by Gergely Daroczi, page 124

"15.2" and "0.04" should be replaced by "13.083" and "0.094", respectively. The author is wrong about the report of the GLM outcome. However, the possible explanation is author actually reported the outcome from some "different" models. The reference group is the low precipitation, which has 14.07 (i.e. the estimated intercept) of SO2 concentration. While the SO2 concentration is 13.083 higher for mid participation and 0.094 higher for high precipitation, respectively, comparing to the reference group.

waterhorse 发表于 2016-9-2 15:46
"15.2" and "0.04" should be replaced by "13.083" and "0.094", respectively. The author is wrong abou ...

thank you for your explanation patiently