共查询到20条相似文献，搜索用时 109 毫秒
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考虑纵向数据半参数回归模型:Y=Xβ+g(T)+ε,基于最小二乘法和局部线性拟合的方法建立了模型中参数分量β,回归函数g(·)和误差方差σ2的估计量,并在适当条件下得到了它们的渐近正态性和最优收敛速度. 相似文献
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考虑如下纵向数据半参数回归模型：yij=xijβ＋g（xij）＋еij,i=1,2,…,n,j=1,2,…,mi,结合现有文献,利用最小二乘法和非参数权函数估计方法给出了模型中参数分量β,回归函数g（.）和误差方差σ2的估计量形式,并在适当条件下,证明了它们的r（r≥2）阶平均相合性。这些结果是截面数据半参数回归模型yi=xiβ＋g（xi）＋еii=1,2,…,n,的研究基础上的推广。 相似文献
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考虑纵向数据半参数回归模型:Y=Xβ g(T) ε,采用二阶段估计方法给出了参数分量β和非参数分量g(t)的估计量^βN和^gN(t),并在适当条件下研究了这些估计量的渐近正态性. 相似文献
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陈琴 《湖州师范学院学报》2009,31(1)
考虑一类新的半参数回归模型Yi=xiβ+g(ti)+σiei,i=1,2,…,n,σi2=f(ui).其中ti为随机设计点列.Yi被随机右截断.将截断样本数据转化为完全样本数据后,用权函数和两阶段最小二乘方法得到了β,g的估计量.在适当的条件下.研究了参数分量β的估计的渐近正态性和非参数分量g的收敛速度,从而丰富了半参数模型的估计理论,并使其应用性更广泛. 相似文献
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利用矩阵广义逆的有关性质,研究了一般线性回归模型设计矩阵Xnxp非列满秩时回归参数β的可估计性,并给出了回归参数β的某些线性函数cTβ可估计的充要条件. 相似文献
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考虑如下纵向数据部分线性模型:yij=x'ijβ+g(xij)+eij·采用最小二乘法和非参数概率权函数估计方法得到模型中参数分量卢和非参数分量g(·)的估计,并在适当条件下证明了参数分量估计量的渐近正态性和非参数分量估计量的最优弱收敛速度. 相似文献
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在线性回归模型Y=Xβ+ε;E(ε)=0;cov=σ2Σ;Σ>0下给出了有偏估计β*(K,d)=(XTΣ-1X+K)-1(XTΣ-1Y+dβ*),其中K>0,d>0为参数,β*表示线性回归模型的广义最小二乘估计,讨论了这种有偏估计的优良性质,得出了主要结论. 相似文献
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胡宏昌 《周口师范学院学报》2008,25(5)
考虑半参数回归模型y1=XTi β g(ti) εi.基于用小波的方法处理非参数分量的基础上,研究了该模型的M估计,得到了参数及非参数分量的线性强表示,并研究了这些表示在收敛速度、重对数律及Berry-Esseen型界限的应用. 相似文献
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对半参数回归模型的研究是近年来统计研究的热点之一,它结合线性回归模型和非参数回归模型,吸收了各自的优点,因此不论是在理论研究上还是实际应用中都具有重要意义.文章总结了国内学者对半参数回归模型研究的贡献,理清了对该模型的理论研究演进的方向和脉络. 相似文献
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熊幼林 《数学学习与研究(教研版)》2014,(9):121
本文针对岭估计和主成分估计的不足,从模型病态的根本原因出发,将模型分解成两个线性回归模型,对参数的两部分分别采用LS估计和岭估计,从而定义了一个新的估计,即主成分—岭估计.通过研究该估计的性质,证明了在均方误差意义下,主成分—岭估计优于岭估计、0-c型岭估计和0-K型广义岭估计,从而为病态线性回归模型系数的估计提供了一种改进的技术途径.1.引言考虑线性回归模型:y=Xβ+e,E(e)=0,Cov(e)=σ2In.(1.1) 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献