矩阵损失下随机效应模型回归系数的齐次线性MINIMAX估计

对于随机效应模型{Y=Xβ ε E(βε)=(Aα0) Cov(βε)=σ2(V1 00 V2),(Vi＞0,i=1,2)这里β和ε分别为p维和n维的随机向量.我们对β和α的可估函数Sα Qβ进行估计,在一定条件下,得出了可估函数Sα Qβ在齐次线性估计类中的唯一的MINIMAX估计.     

一类混合效应模型的统计分析

考虑一类混合效应模型yij=ai xiβ eij,j=1,2,…,mi,i=1,2,…,n,其中Eai=0,Eai2=σa2,Eeij=0,Eeij2=σe2.给出了参数β,σa2和σe2的估计,并证明了这些估计量的强相合性.还讨论了随机效应ai的方差为零的检验问题,给出了检验方案.     

相依误差下回归函数导数估计的渐近分布

设y1,…，yn是固定点x1,…，xn的n个观察值，适合模型yi=g(xi) εi,1≤i≤n。在{εi}为φ－混合、α－混合、ρ－混合误差序列情形下，得到了回归函数导数估计的联合渐近分布。     

一类含随机效应生长曲线模型的谱分解估计

对于含随机效应的生长曲线模型,当随机效应阵D和误差阵R为数乘单位矩阵时,利用向量化算法把模型转化为含两个方差分量的混合效应模型,利用谱分解法能够同时得到模型的固定效应和随机效应的谱分解估计,并给出了估计的性质.     

混合效应模型在道面状态转移概率估计中的应用分析

为研究混合效应Logistic模型确定马尔可夫状态转移概率矩阵的方法及效果,以道面结构厚度、道面使用时间、状态等级和交通量等因素变量为固定效应,以截距为随机效应,建立混合效应Logistic模型.采用多个机场积累的道面实测PCI值为数据源,估计模型参数并作实例分析.结果表明:①应用混合效应Logistic模型可分析多因素对道面使用性能的影响,获得非齐次状态转移概率矩阵,实现道面使用性能马尔可夫动态预测,显著改善概率预测的精度;②混合效应Logistic模型中随机效应能够反映道面数据内不可观测的异质性,降低模型残差的相关性,提高固定效应参数估计的可靠性;③通过对混合效应Logistic模型随机效应参数bi的估计,可得到数据源内任意个体道面的状态转移概率矩阵,克服传统方法多次建模及数据不足的困难,从而实现对特定道面的性能预测.     

随机删失数据下核密度估计的相合性

在{Xi,i≥1}是α混合的随机变量,{Yi,i≥1}是独立同分布的随机变量,且Xi与Yi相互独立的情形下,研究随机删失数据下概率密度函数的核估计,获得此核估计的逐点强相合性和一致强相合性.     

动态平行数据模型中固定效应模型的模型设定问题

将数据生成过程为一阶自回归的时间序列yt=α+ρyt-1+tε,tε~i.i.d(0,σ2),t=1,2,…T的大样本性质推广到动态平行数据模型中,在固定效应模型中构造并证明了模型设定的χ2统计量,并解决了动态平行数据模型中固定效应模型的模型设定问题.     

Ｋronecker乘积在实验设计及分析中的应用

讨论如何用 Kronecker乘积表示一般实验设计模型 ,包括固定效应模型、随机效应模型及混合效应模型 .讨论如何表平方和为向量的二次型 .从而首次给出了用这些表示去计算平方和的期望值的方法 .本文的结果容易推广到其它实验设计模型     

线性混合模型中的固定效应参数的估计

混合效应的线性模型中含有两类参数:一类是固定效应参数,另一类是随机效应部分的方差分量参数.本文主要研究讨论了对于在线性混合模型中的固定效应参数,将不同的线性混合模型转化为满足Guass-Markov假设的线性模型,在此基础上,根据不同的情况,对其中的固定效应参数作最小二乘估计;当模型在较强的复共线性时,相应的对其做岭估计.     

混合系数线性模型参数可容性估计的小样本分析

研究两种混合系数线性模型Zij=[x(tij)]'α+[y(tij)]'βi+εij(i=1,2,…,m;j=1,2,…,ni;ni>p+q)和Zi=Cid+ei(i=1,2,…,m,eiⁱ.i.d(0,YiΣY'i+σ2Ini))参数估计的容许性,可视为一种小样本理论。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the