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约束最小二乘估计的优良性
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作者 刘湘蓉 《高校应用数学学报(A辑)》 CSCD 北大核心 2008年第4期471-475,共5页
对于线性模型y=Xθ+ε,ε服从椭球等高单峰分布,未知参数θ满足不等式约束a′θ≥0,证明了在参数估计优良性的集中概率准则下,θ的约束最小二乘估计θ~*优于最小二乘估计θ.
关键词 约束最小二乘估计 椭球等高分布 单峰密度 集中概率 随机序
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Asymptotic Properties of Wavelet Estimators in a Semiparametric Regression Model with Censored Data 被引量:1
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作者 HU Hongchang FENG Yuan 《Wuhan University Journal of Natural Sciences》 CAS 2012年第4期290-296,共7页
Consider a semiparametric regression model Y_i=X_iβ+g(t_i)+e_i, 1 ≤ i ≤ n, where Y_i is censored on the right by another random variable C_i with known or unknown distribution G. The wavelet estimators of parameter... Consider a semiparametric regression model Y_i=X_iβ+g(t_i)+e_i, 1 ≤ i ≤ n, where Y_i is censored on the right by another random variable C_i with known or unknown distribution G. The wavelet estimators of parameter and nonparametric part are given by the wavelet smoothing and the synthetic data methods. Under general conditions, the asymptotic normality for the wavelet estimators and the convergence rates for the wavelet estimators of nonparametric components are investigated. A numerical example is given. 展开更多
关键词 semiparametric 回归模型 审查数据 小浪估计 asymptotic 规度 概率集中 O 212.1
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