作者porchin (.....)
看板Statistics
标题[问题] 关於回归
时间Tue Jan 9 18:19:28 2007
我想问一题关於回归的问题
这题是期末考的考古题..
但是如果不用电脑，只用计算机，这题我就不知道该如何着手了
consider the model y=β0+β1 x1+β2 x2+ε with the following data:
x1 x2 y
60 50 87.5,88.1,89.5,86.2,90.0,88.2,87.3,89.2,85.9,87.2
120 50 82.5,81.6,77.4,81.5,79.7,81.3,80.7,79.3,82.0,79.2
60 70 77.4,70.7,67.0,71.7,79.2,68.1,65.3,61.0,81.7,60.3
120 70 61.4,67.2,55.9,52.0,63.5,50.7,52.3,68.6,69.5,70.1
Q:can we assume that ε have costant variance?
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1F：推 allen1985:我只想出 慢慢算 画残差图 好像很辛苦 01/09 20:10
2F：推 littleohno:error term的变异就等同於Y的变异 01/10 20:56