[問題] Rao-blackwell 定理
設T為一個任意不偏估計量,且V(T)小於無窮大,又受S為參數θ的一個充份統計量
定義 T* = E (T∣S) = h(S) 則對任意θ屬於母數空間,我們有
E(T*)=θ 且 V(T*)<V(T)
我不懂為什麼 E (T∣S) = h(S) 代表改進原來的統計量T
有那位高手可以指教一下嗎 感激不盡
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