[問題] UMVUE存在性問題
最近在讀density function estimation相關的書,裡面提到了不存在density
function f的UMVUE估計式,而UMVUE的定義為所有不偏估計式中,變異數最小者,
如果不存在UMVUE,那是否可以解釋針對不同的density function f,分別有各自不
同的不偏估計式,可使估計式的變異數最小化?
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