固定设计下半参数回归模型估计的强相合性

对于半参数模型ｙｉ（Ｔ）＝βｘｉ（Ｔ）＋ｇ（ｔｉ（Ｔ））＋εｉ（Ｔ），本文综合最小二乘和一般的非参数估计方法，定义了β，ｇ的估计量βＴ，ｇＴ，在适当条件下证明了它们的强相合性，     

半参数回归的线性小波光滑

考虑半参数回归模型上未知函数,ｙｉ＝ｘ_ｉβ＋ｇ（ｔｉ）＋ｅｉ,１≤ｉ≤ｎ,ｇ（·）为Ｒ~１上未知参数,β∈Ｒ~ｐ为待估参数, Ａｎｔｏｎｉａｄｓ［３］中给出了非参数回归模型的小波估计,借鉴［３］我们利用偏残差法给出了β、ｇ（·）的小波估计β、ｇ（·）．本文研究了β、ｇ（·）的弱相合性及它们偏差和方差的渐近性质,并且得到了β的渐近正态性．     

完全与截尾样本时半参数回归模型估计的强相合性

对于固定设计下的半参数回归模型：ｙ_ｉ=ｘｉβ＋ｇ（ｔｉ）＋ｅｉ,ｉ＝１,…,ｎ．其中｛ｅｉ｝为独立随机误差序列（不必同分布）,且Ｅｅｉ＝０,Ｅｅｉ２＝σ_ｉ~２＞０．对完全和截尾样本,仿文献［２］给出了β、ｇ（·）的估计量,并证明了他们的强相合性．     

矩阵方程AXB=C的通解

本文给出了矩阵方程 Ａ_（ｍ×ｎ）Ｘ_（ｎ×５）Ｂ_（ｓ×）＝Ｃ_（ｍ×ｔ）有解且有无穷解的通解表达式 Ｘ＝Ｃ~（＊＊）＋［ｋ_（１１）ξ_１~Ｔ＋…＋ｋ_（１（ｎ－ｒ））ξ_（ｎ－ｒ）~Ｔ＋……ｋ_（ｓ１）ξ_１~Ｔ＋…＋ｋ_（ｓ（ｎ－ｒ））ξ_（ｎ－ｒ）~Ｔ］ ＋［Ｐ_（１１）η_１＋…＋Ｐ_（１（ｓ－１））η_（ｓ－１）……Ｐ_（ｎ１）η_１＋…Ｐ_（ｎ（ｓ－１））η_（ｓ－１）］~Ｔ（其中ｋ_（ｉｊ）;Ｐ_（ｉｊ）为任意常数;ξ_１…,ξ_（ｎ－ｒ）;η_１…,η_（ｓ－１）分别为Ａ_（ｍ×ｎ）Ｘ_（ｎ×１）＝０;Ｘ_（１×ｓ）Ｂ_（ｓ×ｔ）＝０的一个基础解系,Ｃ~（＊＊）为ＡＸＢ＝Ｃ的一个特解）及利用矩阵初等变换求其通解的方法．     

固定设计下半参数回归模型的参数估计的Bootstrap逼近

考虑固定设计下的半参数回归模型： ｙ_ｉ＝ｘ_ｉβ＋ｇ（ｔ_ｉ）＋ ｅ _ｉ,ｉ ＝１, ２,…; ｎ． 对利用一般非参数估计法结合最小二乘法得到的参数分量β和误差方差σ~２的估计量β_ｎ和σ_ｎ~２,通 过重抽样的方法构造了β_ｎ和σ_ｎ~２的 Ｂｏｏｔｓｔｒａｐ统计量β_ｎ~＊和 σ_ｎ~（＊２）,并证明了在给定原样本的条件下,ｎ~（１／２） （β_ｎ－β_ｎ）和（σ_ｎ~（＊２）－σ_ｎ~２）分别与ｎ~（１／２）（β_ｎ－β）和ｎ~（１／２）（σ_ｎ~２－σ~２）有相同的渐近分布．     

一类新的半参数回归模型中的相合估计

对一类新的半参数回归模型本文综合最小二乘和权函数估计方法，定义了β，ｇ的估计量β＿（ｍ，ｎ）和ｇ＿（ｍ，ｎ）（ｘ），在简洁合理的条件下，证明了它们具有强相合性与ｒ（＞２）阶平均相合性。     

误差为鞅差序列的半参数回归模型估计的相合性

设半参数回归模型Ｙ（ｎ）ｉ＝β·ｘ（ｎ）ｉ＋ｇ（ｔ（ｎ）ｉ）＋Ｅ（ｎ）ｉ,ｉ＝１,２,…,ｎ,本文由最小二乘法和一般加权方法定义的β、ｇ（ｔ）的估计量βｎ,ｇｎ（ｔ）,在误差为鞅差序列下获得了βｎ,ｇｎ（ｔ）的ｒ（≥２）阶平均相合性．     

NA样本下部分线性模型中估计的强相合性

考虑回归模型：ｙｉ＝ｘｉβ＋ｇ（ｔｉ）＋σｉｅｉ，１＜ｉ＜ｎ，其中σ_ｉ～２＝ｆ（ｕｉ），（ｘｉ，ｔｉ，ｕｉ）是固定非随机设计点列，ｆ（·）和ｇ（·）是未知函数，β是待估参数，误差｛ｅｉ｝为ＮＡ变量．我们对β的最小二乘估计βｎ和加权最小二乘估计Ｂｎ，在适当的条件下得到了它们的强相合性．     

混合误差下半参数回归模型小波估计的强相合性

研究了一类半参数回归模型,利用最小二乘法和小波估计法给出了未知参数β和未知函数g(.)的估计.在误差序列为ψ-混合或φ-混合下得到了^β的强相合性,给出了^g(.)的一致强相合性和r阶矩相合性.     

误差为线性过程时半参数模型的估计

对半参数模型Ynt=β·tni＋g（xni）＋εni,（1≤i≤n）,利用一般权函数并综合最小二乘法,定义了β,g的估计量βn,gn．在误差为线性过程时,获得了βn和gn的r阶矩相合性及gn的渐进正态性．     

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.     

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.     

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.     

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     

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     

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.     

Boundedness of commutators related to Marcinkiewicz integrals on hardy type spaces

In this paper, the authors study the boundedness of the operator [μΩ, b], the commutator generated by a function b ∈ Lipβ(Rn)(0 ＜β≤ 1) and the Marcinkiewicz integrals μΩ, on the classical Hardy spaces and the Herz-type Hardy spaces in the case Ω∈ Lipα(Sn-1)(0 ＜α≤ 1).     

Jacobi polynomials used to invert the laplace transform

Given the Laplace transform F(s) of a function f(t), we develop a new algorithm to find an approximation to f(t) by the use of the classical Jacobi polynomials. The main contribution of our work is the development of a new and very effective method to determine the coefficients in the finite series expansion that approximation f(t) in terms of Jacobi polynomials. Some numerical examples are illustrated.     

Generalization of the interaction between Haar approximation and polynomial operators to higher order methods

In applications it is useful to compute the local average empirical statistics on u. A very simple relation exists when of a function f（u） of an input u from the local averages are given by a Haar approximation. The question is to know if it holds for higher order approximation methods. To do so, it is necessary to use approximate product operators defined over linear approximation spaces. These products are characterized by a Strang and Fix like condition. An explicit construction of these product operators is exhibited for piecewise polynomial functions, using Hermite interpolation. The averaging relation which holds for the Haar approximation is then recovered when the product is defined by a two point Hermite interpolation.