Monday, December 23, 2024

The Complete Guide To Umvue

一般来说:第一步:寻找充分完备统计量:充分性(Sufficient):利用Fisher-Neyman Factorization Theorem寻找充分统计量T,然后证明其完备性;完备性(Complete):如果随机变量是指数分布族的话,并且参数 \theta\in \Theta\subset \mathbb{R}^{k} , \Theta 包含一个在 \mathbb{R}^{k} 的开集,那么可以利用指数分布族的定理证T的完备性。如果不是的话,利用完备性的定义证明:\mathbf{E}_{\theta}g(T) = 0 \text{ for all }\theta\in\Theta,\text{ then } P_{\theta}[g(T)=0]=1(某个套路:求出T的概率分布,然后假设一个符合上述条件的函数g,写出 \mathbf{E}_{\theta}g(T) ,然后对 \theta 求导,证其导数为0,从而证出g(T)=0 a. Web.

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