Ornstein-Uhlenbeck随机波动率模型的参数估计

本文研究了波动率过程为Ornstein-Uhlenbeck过程,且波动率过程与股票价格过程的相关系数ρ可为[0,1]中的任一数的随机波动率模型参数估计.给出了OU过程的统计性质,并利用鞅极限理论给出模型中参数的估计式,证明估计量是具有渐进正态性从而是相合的.     

带复合泊松跳扩散模型的点波动率门限估计量的渐近性质

本文研究了带复合泊松跳扩散模型的点波动率门限估计量的渐近性质.利用门限方法和核函数技术,构造并证明了此模型点波动率估计量的渐近正态性.同时,应用Grtner-Ellis定理及大偏差中的Delta方法,得到了估计量的中偏差原理.     

失效原因缺失的加速失效时间模型下竞争风险数据的半参数估计

本文在加速失效时间模型下,研究了竞争风险数据失效原因缺失情况下模型系数的估计问题。在随机缺失的假设下,利用倒概率加权和双重稳健增广技术构建估计方程,用非参数的核光滑方法估计失效原因缺失的概率。通过将估计方程转化成优化问题的方式,给出了求解估计方程的算法,研究了所提出估计量的渐近性质,通过随机模拟来评价估计量的表现,并将提出的估计方法用于研究实际的乳腺癌数据.     

变系数部分线性模型的加权随机约束s-K估计

研究随机约束条件下半参数变系数部分线性模型的参数估计问题,当回归模型线性部分变量存在多重共线性时,基于Profile最小二乘方法、s-K估计和加权混合估计构造参数向量的加权随机约束s-K估计,并在均方误差矩阵准则下给出新估计量优于s-K估计和加权混合估计的充要条件,最后通过蒙特卡洛数值模拟验证所提出估计量的有限样本性质.     

变系数联立模型的局部线性广义矩变窗宽估计

在随机设计条件下,提出了一类变系数联立模型,运用局部线性广义矩变窗宽估计,对模型的变系数进行了估计,研究了估计量的大样本性质.利用概率论中大数定律和中心极限定理,证明了估计量的大样本性质,局部线性广义矩变窗宽估计具有相合性和渐进正态性.     

缺失数据下基于众数回归的变系数部分非线性模型的估计

针对响应变量随机缺失的变系数部分非线性模型,提出了一种稳健的基于众数回归的估计方法.采取逆概率加权方法,利用QR正交分解技术,分别得到了未知参数和变系数函数的众数回归估计量.在一定条件下,证明了估计量的渐近性质.通过数值模拟和实际数据分析,说明了所提估计方法的有效性.     

部分线性变系数模型的随机约束岭估计

作为变系数模型和部分线性模型的推广,部分线性变系数模型近年来得到越来越多的关注.本文考虑该模型在线性部分自变量存在多重共线性并且参数分量附加有随机约束条件时的估计问题.基于profile最小二乘技术以及岭估计和混合估计方法,构造参数分量的profile混合岭估计,并且研究所提估计量的渐近性质.最后利用数值模拟验证所提估计方法的有效性.     

基于联合估计方法的广义随机系数自回归模型的统计推断

本文利用联合估计函数方法(CEF)对广义随机系数自回归(GRCA)模型进行统计研究.应用联合估计函数方法得到广义随机系数自回归模型参数估计量,证明了提出的参数估计量的相合性和渐近正态性,利用数值模拟对提出的参数统计量进行对比分析,数值模拟结果表明,联合估计方法的参数估计量优于基于估计函数方法、伪极大似然方法、最小二乘方法的参数估计量,实证研究也说明CEF方法具有较好的效果.     

部分线性变系数模型改进的加权混合Profile-Liu估计

研究半参数部分线性变系数模型的有偏估计,当回归模型参数部分自变量存在多重共线性时,在随机线性约束条件下,融合Profile最小二乘估计、加权混合估计和Liu估计构造回归模型参数分量改进的加权混合Profile-Liu估计,并在一定正则条件下证明估计量的渐近性质,最后利用蒙特卡洛数值模拟验证所提出估计量的有限样本表现性.     

高维欧式期权定价模型的奇摄动解

讨论了一类欧式期权定价问题的随机波动率模型,其随机波动率采用快速均值回归的随机波动率模型.通过采用奇摄动方法,得到了多风险资产欧式期权价格的形式渐近展开式,得到该合成展开式的一致有效误差估计.     

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.