抽樣方法 - 考試
By Edith
at 2013-09-25T16:56
at 2013-09-25T16:56
Table of Contents
黃文隆p.8-30 對迴歸雙重估計中變異數證明過程(定理8.5)有疑問請教:
書上假設輔助變數Xi~N(0,Sx^2).則Σ(Xi - X_bar)/Sx^2 服從degree為n-1的chi-square
分配.
其中n-1來源是因雙重估計法的X_bar未知用sample mean x_bar取代,
可是Xi的maen都為0,此時X_bar應為0.為何會寫X_bar?
而且如果都為0,那第一重樣本感覺估計X_bar是估心酸的....
因此小弟認為Xi~N(x_bar,Sx^2)才是.
不知我觀念是否哪裡有錯誤.煩請指正,感謝!
--
一個人澈悟的程度
恰等于他所受痛苦的深度
~~林語堂
--
書上假設輔助變數Xi~N(0,Sx^2).則Σ(Xi - X_bar)/Sx^2 服從degree為n-1的chi-square
分配.
其中n-1來源是因雙重估計法的X_bar未知用sample mean x_bar取代,
可是Xi的maen都為0,此時X_bar應為0.為何會寫X_bar?
而且如果都為0,那第一重樣本感覺估計X_bar是估心酸的....
因此小弟認為Xi~N(x_bar,Sx^2)才是.
不知我觀念是否哪裡有錯誤.煩請指正,感謝!
--
一個人澈悟的程度
恰等于他所受痛苦的深度
~~林語堂
--
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考試
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