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随机效应模型中方差分量渐近最优的经验Bayes估计 总被引:3,自引:0,他引:3
本文在加权二次损失下导出了双向分类随机效应模型中方差分量的Bayes估计,并利用多元密度函数及其混合偏导数核估计的方法构造了方差分量的经验Bayes(EB)估计.在适当的条件下证明了EB估计的渐近最优性,给出了模型的特例和推广.最后,举出一个满足定理条件的例子. 相似文献
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对非平衡单向分类随机效应模型中方差分量找到了其最小充分统计量,在加权平方损失下导出了其Bayes估计,利用多元密度及其偏导数的核估计方法构造了方差分量的经验Bayes(EB)估计,并导出了其收敛速度.文末用例子说明了符合定理条件的先验分布是存在的. 相似文献
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单向分类随机效应模型中方差分量的渐近最优经验Bayes估计 总被引:2,自引:0,他引:2
本文在加权平方损失下导出了单向分类随机效应模型中方差分量的Bayes估计, 利用多元密度及其偏导数的核估计方法构造了方差分量的经验Bayes(EB)估计,证明了 EB估计的渐近最优性.文末还给出了一个例子说明了符合定理条件的先验分布是存在 的. 相似文献
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In this paper,the mixed estimations of regression coefficient in multivariate linear model is giyen on the condition of expanding sample data and their optimalities are considered.It is shown that GLSE is equivalent to the above mentioned mixed estimations.Furthermore,Bayes estimation in multivariate normal model,which is the same as the mixed estimations,is also improved. 相似文献
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一个Gauss因果模型中常常存在不只一种识别因果效应的方法, 不同的方法对应的估计可能不同. 该文对Pearl等人提出的前门准则, 后门准则,工具变量准则等识别方法的估计精度进行了分析比较, 并给出了相应的模拟结果, 为实践中选择更优的识别准则提供了依据. 相似文献
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AR模型阶数依平方损失函数下的Bayes估计 总被引:4,自引:0,他引:4
本文在假定模型阶数K有已知上界、并为离散随机变量,且具有一定的先验概率函数的情况下,讨论了在平方损失下AR模型阶数的Bayes估计,并证明了所给的估计量是有一致性的估计。 相似文献
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在某种正则条件下,对Bayes估计尾概率收敛速度问题进行了讨论。利用似然理论方法得到了Bayes估计的中偏差下界,从而改善了Bahadur型的收敛结果。 相似文献
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MixedEstimationsandBayesEstimationoftheRegressionCoefficientinMultivariateLinearModel¥HuangYangxin(黄养新)(WuhanUniversityofTech... 相似文献
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在线性模型中回归系数与误差方差具有正态-逆Gamma先验时,导出了回归系数与误差方差的同时Bayes估计.在均方误差矩阵准则和Bayes Pitman closeness准则下,研究了回归系数的Bayes估计相对于最小二乘(LS)估计的优良性,还讨论了误差方差的Bayes估计在均方误差准则下相对于LS估计的优良性. 相似文献
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本文利用密度的混合偏导数的核估计,构造出线性模型中误差协方差阵的逆的经验Bayes(EB)估计,在一定条件下,还证明了EB估计的收敛速度可任意接近于1,最后,给出了一个实例。 相似文献
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王立春 《数学物理学报(A辑)》2006,26(6):938-947
该文运用经验贝叶斯(empirical Bayes(简称EB))方法,在历史样本和当前样本均被另一个具有未知分布的变量随机右删失的条件下,构造了一个指数分布参数的经验贝叶斯估计并获得了它的渐近最优性.文章最后给出了一个例子和模拟结果. 相似文献
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Marianna Pensky 《Annals of the Institute of Statistical Mathematics》2002,54(1):83-99
The traditional empirical Bayes (EB) model is considered with the parameter being a location parameter, in the situation when the Bayes estimator has a finite degree of smoothness and, possibly, jump discontinuities at several points. A nonlinear wavelet EB estimator based on wavelets with bounded supports is constructed, and it is shown that a finite number of jump discontinuities in the Bayes estimator do not affect the rate of convergence of the prior risk of the EB estimator to zero. It is also demonstrated that the estimator adjusts to the degree of smoothness of the Bayes estimator, locally, so that outside the neighborhoods of the points of discontinuities, the posterior risk has a high rate of convergence to zero. Hence, the technique suggested in the paper provides estimators which are significantly superior in several respects to those constructed earlier. 相似文献
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Tang Shengdao 《大学数学》1998,(4)
在指数分布场合,定数或定时截尾试验,文[1]给出了参数λ在先验分布为Γ(α,β)分布的假设下的Bayes估计.文[3]给出了在平方损失下的Bayes估计.本文讨论先验分布为B(a,b)分布时,参数λ的Bayes估计. 相似文献
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Marianna Pensky 《Journal of multivariate analysis》1999,69(2):242
We consider independent pairs (X1, Σ1), (X2, Σ2), …, (Xn, Σn), where eachΣiis distributed according to some unknown density functiong(Σ) and, givenΣi=Σ,Xihas conditional density functionq(xΣ) of the Wishart type. In each pair the first component is observable but the second is not. After the (n+1)th observationXn+1is obtained, the objective is to estimateΣn+1corresponding toXn+1. This estimator is called the empirical Bayes (EB) estimator ofΣ. An EB estimator ofΣis constructed without any parametric assumptions ong(Σ). Its posterior mean square risk is examined, and the estimator is demonstrated to be pointwise asymptotically optimal. 相似文献
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GENG Zhi HE Yangbo & WANG XueliSchool of Mathematical Sciences LMAM Peking University Beijing China 《中国科学A辑(英文版)》2004,47(5):730-740
This paper discusses the relationship among the total causal effect and local causal effects in a causal chain and identifiability of causal effects. We show a transmission relationship of causal effects in a causal chain. According to the relationship, we give an approach to eliminating confounding bias through controlling for intermediate variables in a causal chain. 相似文献
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Under square loss,this paper constructs the empirical Bayes(EB) estimation for the parameter of normal distribution which has both asymptotic optimality and admissibility. Moreover,the convergence rate of the EB estimation obtained is proved to be O(n~(-1)). 相似文献