[問題] 信賴區間和覆蓋率的問題?
假設我們要估計參數θ,找到一個估計量θ^,
並且用bootstrap的方式找出stand error
接著建立95%信賴區間C.I.,重複產生100組樣本,
並且算出100個θ^的值,建立100組C.I.,發現
100組裡卻只有80多組有包含θ(因為是模擬所以θ已知),
請問會造成這種現像的可能原因有哪些?
我自己想來想去只想到估計量θ^可能是有偏的估計量,
不知還有沒有其他因素,請教版上大大,謝謝
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