[問題] 關於回歸

[porchin (.....)]

我想問一題關於回歸的問題
這題是期末考的考古題..
但是如果不用電腦，只用計算機，這題我就不知道該如何著手了


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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推 allen1985:我只想出 慢慢算 畫殘差圖 好像很辛苦
推 littleohno:error term的變異就等同於Y的變異