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在"nex损失函数下,讨论Pareto分布族参数的经验Bayes(EB)估计问题,文中构造了参数的EB估计,在适当的条件下给出了该估计的收敛速度.最后给出满足定理条件的例子. 相似文献
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对连续型单参数指数族在平方损失下导出了参数的Bayes估计,利用同分布负相协(NA)样本构造了经验Bayes(EB)估计量,并在适当条件下获得了EB估计的收敛速度.文末给出一个满足定理条件的例子. 相似文献
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刻度指数族参数的经验Bayes估计的收敛速度 总被引:8,自引:0,他引:8
本文对刻度指数族在加权平方损失下获得了参数的Bayes估计,并构造了相应的经验Bayes(EB)估计,证明了所提出的EB估计是渐近最优的且有收敛速度(),其中1/2<λ<1,s≥3是一给定的整数.最后,给出了刻度指数族EB估计的两个应用. 相似文献
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双指数分布位置参数的经验Bayes估计问题 总被引:2,自引:0,他引:2
本文在平方损失下导出了双指数分布位置参数的Bayes估计,利用非参数方法构造了位置参数的经验Bayes(EB)估计.在适当的条件下,获得了EB估计的收敛速度.最后,给出了一个例子说明适合定理条件的先验分布是存在的. 相似文献
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LINEX损失下Pareto分布族参数的经验Bayes估计 总被引:1,自引:0,他引:1
在 L inex损失函数下 ,讨论 Pareto分布族参数的经验 Bayes(EB)估计问题 ,文中构造了参数的 EB估计 ,在适当的条件下给出了该估计的收敛速度 .最后给出满足定理条件的例子 . 相似文献
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师义民 《高校应用数学学报(A辑)》2000,15(4):475-483
在Linex损失函数下,讨论一类双边截断型分布族参数的经验Bayes(EB)估计问题, 构造了参数的EB估计,在适当的条件下给出了该估计的收敛速度.最后给出例子,说明定理条件的合理性. 相似文献
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加权平方损失下伽玛分布族Γ(θ,1/2)参数θ的EB估计 总被引:1,自引:0,他引:1
在加权平方损失函数下讨论了伽玛分布族T(θ,1/2)参数θ的经验Bayes(EB)估计,并讨论了EB估计的收敛速度问题,在一定条件下,收敛速度可充分接近于1. 相似文献
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本文对刻度指数族在加权平方损失下获得了参数的Bayes估计,并构造了相应的经验Bayes(EB)估计,证明了所提出的EB估计是渐近最优的且有收敛速度,其中1/2≤λ<1,s≥3是一给定的整数.最后,给出了刻度指数族EB估计的两个应用. 相似文献
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本文研究了线性指数分布参数的渐近最优的经验Bayes估计问题.利用概率密度函数的核估计,构造了参数的经验Bayes(EB)估计,获得了所提出的EB估计是渐近最优的. 相似文献
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Dominique Fourdrinier William E. Strawderman 《Annals of the Institute of Statistical Mathematics》2003,55(4):803-816
We consider estimation of loss for generalized Bayes or pseudo-Bayes estimators of a multivariate normal mean vector, θ. In
3 and higher dimensions, the MLEX is UMVUE and minimax but is inadmissible. It is dominated by the James-Stein estimator and by many others. Johnstone (1988,
On inadmissibility of some unbiased estimates of loss,Statistical Decision Theory and Related Topics, IV (eds. S. S. Gupta and J. O. Berger), Vol. 1, 361–379, Springer, New York) considered the estimation of loss for the usual
estimatorX and the James-Stein estimator. He found improvements over the Stein unbiased estimator of risk. In this paper, for a generalized
Bayes point estimator of θ, we compare generalized Bayes estimators to unbiased estimators of loss. We find, somewhat surprisingly,
that the unbiased estimator often dominates the corresponding generalized Bayes estimator of loss for priors which give minimax
estimators in the original point estimation problem. In particular, we give a class of priors for which the generalized Bayes
estimator of θ is admissible and minimax but for which the unbiased estimator of loss dominates the generalized Bayes estimator
of loss. We also give a general inadmissibility result for a generalized Bayes estimator of loss.
Research supported by NSF Grant DMS-97-04524. 相似文献
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陈兰祥 《应用数学学报(英文版)》1995,11(1):11-16
GAMMA-MINIMAXESTIMATORSFORTHEMEANOFAMULTIVARIATENORMALDISTRIBUTIONWITHPARTIALLYUNKNOWNCOVARIANCEMATRIXCHENLANXING(陈兰祥)(Depart... 相似文献
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复共线性与广义岭型估计 总被引:1,自引:0,他引:1
针对线性回归模型Y=Xβ+l的典则形式Y=a01+Z+l,l~(0,σ2I)在设计阵X呈病态时,提出了一类新估计■(k;q)=〔Λ1OOkIq+Λ2〕-1Z′Y,称之为广义岭型估计.优点是结合主成分估计和岭估计的思想和方法,将X′X的特征值分为不同大小属性的两部分Λ1与Λ2,并分别添加不同的常数,致使新估计类的均方误差大幅降低的同时计算量大大减少,而且便于对原变量做出解释.文中进一步讨论了该估计优于岭估计的k的存在性以及充分条件. 相似文献
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We establish uniform and non-uniform asymptotic simultaneous confidence bands for functionals of the distribution based on
kernel-type estimators, which include the Nadaraya-Watson kernel estimators of regression functions and the Akaike-Parzen-Rosenblatt
kernel density estimators. Our theorems, based upon functional limit laws derived by modern empirical process theory, allow
data-driven local bandwidths for these statistics.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Huber's contaminated model is a basic model for data with outliers. This paper aims at addressing several fundamental problems about this model. We first study its identifiability properties. Several theorems are presented to determine whether the model is identifiable for various situations. Based on these results, we discuss the problem of estimating the parameters with observations drawn from Huber's contaminated model. A definition of estimation consistency is introduced to handle the general case where the model may be unidentifiable. This consistency is a strong robustness property. After showing that existing estimators cannot be consistent in this sense, we propose a new estimator that possesses the consistency property under mild conditions. Its adaptive version, which can simultaneously possess this consistency property and optimal asymptotic efficiency, is also provided. Numerical examples show that our estimators have better overall performance than existing estimators no matter how many outliers in the data. 相似文献
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指数分布参数多层Bayes和E Bayes估计的性质 总被引:1,自引:0,他引:1
本文讨论无失效数据下指数分布参数多层Bayes估计和E Bayes估计的性质,在超参数分别取两种不同的先验分布下,证明参数的多层Bayes估计和E Bayes估计渐近相等,且多层Bayes估计值小于E Bayes估计值. 相似文献