Multiple imputation of missing data with ante-dependence covariance structure

A controlled clinical trial was conducted to investigate the efficacy effect of a chemical compound in the treatment of Premenstrual Dysphoric Disorder (PMDD). The data from the trial showed a non-monotone pattern of missing data and an ante-dependence covariance structure. A new analytical method for imputing the missing data with the ante-dependence covariance is proposed. The PMDD data are analysed by the non-imputation method and two imputation methods: the proposed method and the MCMC method.     

绿党对宪法基本原则的挑战

绿党是西方兴起的一种新的政治力量,其哲学观是把生态环境利益上升为人类最高利益,并以自然生态环境为国家社会中心的生态中心主义,它的出现带来的是对传统价值观念、经济发展模式的变革性的挑战,对宪法基本原则的挑战也不容忽视。其生态权利之上的价值观对宪法基本原则的挑战表现为人民主权原则的动摇、基本人权原则的错位、权力制约原则的变异和法治原则的化。     

论民事证据法上的诚信原则

诚信原则在民法与民事诉讼法上具有十分重要的地位,其在民事证据法领域的适用在最高人民法院《关于民事诉讼证据的若干规定》中有所体现。现行立法关于举证时限与证据失权、证人真实义务、举证责任分配与证据审查判断的相关规则在一定程度上体现了诚信原则之精神,但远非完善。为了促进民事司法公正与效率的实现,不仅应该确立诚信原则在立法上的原则地位,而且要将其转化为可以操作的具体规范,以建立完善的诚信规则体系。     

价值观的形成规律与当代青年价值观现状

价值观的形成有其自身的规律 ,并受到社会因素和个体内在因素的影响。当代青年正处在我国改革开放进一步深化和社会主义市场经济体制逐步确立及自我意识发展和自我需要扩大的时期 ,因此 ,他们的价值观必然打着当今时代的烙印 ,具有开放性、先锋化、情绪性等特点 ,他们追求高效、公正、互利 ,追求求职与成才相结合 ,但同时 ,其自身的身心失范问题也日趋严重。     

英语广告语与礼貌原则的和谐与冲突

礼貌原则是指导人们进行成功交际的重要原则。英语广告实际上也是厂商与消费者之间的一种对话与交流 ,礼貌原则对语言的运用同样具有极大的指导作用。然而 ,笔者在分析大量成功的英语广告时发现 ,其中语言的运用并非完完全全地与礼貌原则的要求一致 ,二者之间有着冲突的现象。本文试图就礼貌原则中各条准则与英语广告语言的和谐与冲突现象进行分析 ,并就其成因进行探讨     

Asymptotic bias in the linear mixed effects model under non-ignorable missing data mechanisms

Summary.  In longitudinal studies, missingness of data is often an unavoidable problem. Estimators from the linear mixed effects model assume that missing data are missing at random. However, estimators are biased when this assumption is not met. In the paper, theoretical results for the asymptotic bias are established under non-ignorable drop-out, drop-in and other missing data patterns. The asymptotic bias is large when the drop-out subjects have only one or no observation, especially for slope-related parameters of the linear mixed effects model. In the drop-in case, intercept-related parameter estimators show substantial asymptotic bias when subjects enter late in the study. Eight other missing data patterns are considered and these produce asymptotic biases of a variety of magnitudes.     

西部高校怎样更好实现计算机与物理实验的整合

随着计算机的飞速发展,学校里出现了越来越多的多媒体教室;CAI计算机辅助教学、虚拟实验教学等各种软件更是蓬勃发展起来;很多教育工作者提出物理实验中计算机仿真教学、物理实验中应用计算机辅助教学等各种措施.作为西部高校,我们应该根据自身资金有限、学生基础比较薄弱等特点,更好的实现计算机与物理实验的整合.     

Influence diagnostics and outlier tests for semiparametric mixed models

Summary. Semiparametric mixed models are useful in biometric and econometric applications, especially for longitudinal data. Maximum penalized likelihood estimators (MPLEs) have been shown to work well by Zhang and co-workers for both linear coefficients and nonparametric functions. This paper considers the role of influence diagnostics in the MPLE by extending the case deletion and subject deletion analysis of linear models to accommodate the inclusion of a nonparametric component. We focus on influence measures for the fixed effects and provide formulae that are analogous to those for simpler models and readily computable with the MPLE algorithm. We also establish an equivalence between the case or subject deletion model and a mean shift outlier model from which we derive tests for outliers. The influence diagnostics proposed are illustrated through a longitudinal hormone study on progesterone and a simulated example.     

数据挖掘与数据仓库在CRM中的应用

介绍了客户关系管理的思想、功能组成 ,以及数据挖掘和数据仓库技术在客户关系管理中的应用     

论20世纪50年代中美在台湾问题上的较量

台湾问题历来是影响中美关系的焦点 ,美国为了阻遏共产主义势力的蔓延 ,从军事、外交、经济上采取孤立中国的政策 ,企图“划峡而治之” ,制造“两个中国” ,对此 ,中国政府进行了针锋相对的斗争 ,坚持台湾是中国的领土 ,坚决捍卫“一个中国”原则 ,从而粉碎了美国的阴谋。