Minimax estimation of linear functionals over nonconvex parameter spaces
Minimax estimation of linear functionals over nonconvex parameter spaces
复制标题
非凸参数空间上线性泛函的极小极大估计
DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
T. Cai
中科院分区:
文献类型:
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作者:
Mark G. Low;T. Cai
The minimax theory for estimating linear functionals is extended to the case of a finite union of convex parameter spaces. Upper and lower bounds for the minimax risk can still be described in terms of a modulus of continuity. However in contrast to the theory for convex parameter spaces rate optimal procedures are often required to be nonlinear. A construction of such nonlinear procedures is given. The results developed in this paper have important applications to the theory of adaptation.