回归系数的混合估计与最小二乘估计的一个新的相对效率

本文对具有附加信息的线性回归模型中的混合估计与最小二乘估计给出了一种新的相对效率,研究了新的相对效率与其它几种相对效率的关系,得出了新的相对效率的上、下界.     

线性模型中最小二乘估计的一种新的相对效率

对于线性模型未知参数最小二乘估计，本文提出了一种新的相对效率，并研究了它的性质，以及与Bloonfield-Watson等，讨论过的另一种相对效率的关系。     

奇异线性模型最小二乘估计的相对效率

对于奇异线性模型引入了参数β的最小二乘估计相对与最佳线性无偏估计的一种新的相对效率，并讨论了它的下界。     

线性模型中加权混合估计相对于最小二乘估计的两种相对效率

本文提出了线性模型中加权混合估计相对于最小二乘估计的两种相对效率,并给出了这些相对效率的上下界.     

线性模型参数估计的一种新的相对效率

本文对线性模型的最小二乘估计（ＬＳＥ）与最佳线性无偏估计（ＢＬＵＥ）提出了一种新的相对效率并给出了新的相对效率的上、下界,最后还讨论了新的相对效率与已有的几种相对效率的关系。     

奇异线性模型最小二乘估计的相对效率

刘爱义，王松挂在文[1]中提出了线性模型未知参数的最小二采估计的一种新的相对效率，本文将在奇异线性模型下，研究量小二乘估计的相对效率的下界。     

聚集数据线性模型参数估计的相对效率与广义相关系数

对于聚集数据的线性模型,本文给出了Peter—Karsten估计相对于最佳线性无偏估计的一个相对效率,得到了相对效率的下界,讨论了该相对效率与广义相关系数的关系.     

平衡损失下回归系数最优线性无偏估计的相对效率

本文研究了一般Gauss-Markov模型中回归系数的最优线性无偏估计的相对效率问题.利用Lagrange乘数法,获得了回归系数的最优线性无偏估计.并在此基础上定义了最优线性无偏估计的两种相对效率.     

回归系数的混合估计与最小二乘估计的两种相对效率

本文研究了线性回归模型中,回归系数的混合估计与最小二乘估计的相对效率,利用矩阵的相关性质和运算,导出了两者之间两种新的相对效率的上下界.     

聚集数据多元线性模型参数的多元聚集广义岭估计的相对效率

对于聚集数据的多元线性模型,提出了参数的多元聚集广义岭估计的概念,给出了多元聚集广义岭估计相对于最小二乘估计及最佳线性无偏估计的两种相对效率,并得到了这两种相对效率的上界.     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

Instructions for Authors

<正>Submission Authors must use LaTeX for typewriting,and visit our website www.actamath.com to submit your paper.Our address is Editorial Office of Acta Mathematica Sinica,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,P.R.China.     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

正August 10-14,2015Beijin,China The International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.     

A unified approach to certain problems of best local approximation

In this paper we study best local quasi-rational approximation and best local approximation from finite dimensional subspaces of vectorial functions of several variables. Our approach extends and unifies several problems concerning best local multi-point approximation in different norms.     

Towards Excellence in Science Chinese Academy of Sciences

<正>May 26,2014,Beijing Science is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientific knowledge system created by     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

<正>August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists     

Bounds for the zeros of polynomials

Let P(z)=∑↓j=0↑n ajx^j be a polynomial of degree n. In this paper we prove a more general result which interalia improves upon the bounds of a class of polynomials. We also prove a result which includes some extensions and generalizations of Enestrǒm-Kakeya theorem.