Selecting a minimax estimator doing well at a point

Selecting a minimax estimator doing well at a point
复制标题

选择在某个点表现良好的极小极大估计器

DOI:
10.1016/0047-259x(86)90091-6
复制
发表时间:
1986
影响因子:
1.6
通讯作者:
Z. Zheng
Z. Zheng
中科院分区:
数学2区
文献类型:
--
作者:
Z. Zheng

文献摘要

被引文献

相似文献

设X1-N(ei,I,i),i= 1,2,...,n(n> p+ 1,p> 1)是p维向量的独立有限序列。令X=(X,,...,X1,. 0、)。Efron和Morris [2]推广了James-Stein估计:他们证明了X-(np-1)SC 'X(沿着其正部分(I-(np-1)Sl)+ X)是Minimax估计. Stein [3]考虑了X+ Vlnf(1)型估计,其中I=(II,I,...,Z,Z '是具有分量I,> Z2>的向量。lp 2 0,S= XX '的特征根,V lnf(f)=((a/Y,)lnf(Z))是函数In f(Z)的偏导数矩阵.他给出了一个条件下,相应的估计X+ V的Inf(1)是极大极小。Zheng [4]给出了一类形式为X+ Vlnf(l)的极大极小估计,其中
Let Xi-N (ei, I,), i= 1, 2,..., n (n> p+ 1, p> 1) be an independent finite sequence of p-dimensional vectors. Let X=(X,,..., X,,) be p xn matrix of random variables with the matrix of means 6=(or, e,,..., 0,). Efron and Morris [2] generalized the James-Stein estimator: they proved that X-(np-1) SC’X (along with its positive part (I-(np-1) Sl)+ X) is a minimax estimator. Stein [3] considered the estimators of form X+ V lnf (l), where I=(II, I,,..., Z,)’is a vector with components I,> Z2>.** lp 2 0, the characteristic roots of S= XX’, and V lnf (f)=((a/&Y,) lnf (Z)) is the matrix of partial derivatives of the function In f (Z). He gave a condition under which the corresponding estimator X+ V Inf (l) is minimax. Zheng [4] gave a class of minimax estimators of the form X+ V lnf (l), where