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兩題迴歸跟一題抽樣~20點
Aug 24th 2013, 09:01

1.利用迴歸模式來預估未來趨勢要非常小心,為什麼?(10分)
2.在簡單迴歸模式下,若Y值不變同數目的X設定值之全距擴大為四倍,請問b1及其變異數有何改變
3.http://www.public.tw/prog/dannyer/exam_papers130130/Uploads/101%E9%AB%98%E8%80%83-%E6%8A%BD%E6%A8%A3%E6%96%B9%E6%B3%95.pdf
其中第二頁的中間有一個(二),證明E(s^2)=S^2這個證明,想詢問為什麼(yi-Y+Y-yi)^2取總合再取期望值,下一行中間為什麼式加號???我怎麼算都是減號(yi-Y+Y-yi)^2使用平方差公式展開,a^2-2ab+b^2,2ab為零,不是指剩家號嗎?還是他的算法不是這樣~?????

麻煩大大解答一下~謝謝!!!!

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