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《Journal of Qufu Normal University(Natural Science)》 1989-01
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Two Necessary and Sufflclent Condijions for the Most Efficient of A Parameterss

zhang shangzhi Jiangxi Vniversity  
In this paper, We have obtained the following results: Theoreml A necessary and sufficient condifion for an esfimate Tto be most e- fficient is the reltionship (?)logL/(?)θ=c(θ) [T(s)-θ] a. s for all θ∈Θ hald Theorem 2 A neccessary and sufficient conditionfor an estimate T to be most efficient is that T be sufficient and the relationship (?)logf_T/(?)θ=c(θ) [T(s)-θ] a. s for all θ∈Θ hold.
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