Which Wald statistic? Choosing a parameterization of the Wald statistic to maximize power in k-sample generalized estimating equations

The Wald statistic is known to vary under reparameterization. This raises the question: which parameterization should be chosen, in order to optimize power of the Wald statistic? We specifically consider k-sample tests of generalized linear models (GLMs) and generalized estimating equations (GEEs) in which the alternative hypothesis contains only two parameters. An example is presented in which such an alternative hypothesis is of interest. Amongst a general class of parameterizations, we find the parameterization that maximizes power via analysis of the non-centrality parameter, and show how the effect on power of reparameterization depends on sampling design and the differences in variance across samples. There is no single parameterization with optimal power across all alternatives. The Wald statistic commonly used under the canonical parameterization is optimal in some instances but it performs very poorly in others. We demonstrate results by example and by simulation, and describe their implications for likelihood ratio statistics and score statistics. We conclude that due to poor power properties, the routine use of score statistics and Wald statistics under the canonical parameterization for GEEs is a questionable practice.     

新形势下高校学生资助与培养教育探析

国家资助政策是家庭经济困难学生顺利完成学业的重要保障，是党和国家惠民政策的具体体现，是高校正常开展教育教学活动的基础，是和谐校园建设的重要组成部分：新形势下，高校在开展资助工作的过程中，不是简单的资金发放，而应该是把资助与大学生的培养教育有机结合起来，让学生在受到经济资助、分享党的温暖的同时，懂得如何才能成长为一名社会主义合格的建设者和可靠接班人。     

Employment and filial relations: Is there a conflict?

Since children, particularly daughters, are among the most important sources of help and support for older Americans, it has been suggested that women's increasing employment will affect filial relations. Empirical evidence on this issue is inconsistent, in part due to the use of nonprobability samples. Few studies have measured effects for men. We attempt to broaden the scope of this question beyond help to the frail elderly by asking whether employment affects filial relations in general. We examine effects of hours employed on telephone contact, visiting, feelings of closeness, filial attitudes, and assistance to biological parents, for an area probability sample of men and women over 40. There are no effects of employment for men or women on contact, closeness, or assistance. For the vast majority of this population sample, contact and assistance involve few hours per week, and thus do not seem to conflict with employment.     

我国研究型教师队伍建设的对策研究

建设研究型教师队伍在实施“科教兴国”战略方面具有基础性的重要作用。我国应当采取切实的措施，建设好数量充足的高素质科研师资队伍，为实施素质教育，培育创造型人才奠定师资基础。     

刑法罪名简繁利弊辩--以中、日刑事立法比较为例

近年来,在刑事司法中时常遇到这样的问题1997年才全面修订的、有400多个罪名的刑法典对一些犯罪案件却难以适用.通过对中、日两国刑事立法的比较分析,探讨了刑法罪名简略与繁缛的利弊得失.认为罪名的简繁各有利弊,但简略利大于弊;法的特性决定罪名的高度概括性;刑法的适用需要法官的判断和推理;关键是尽快改革司法体制,大力提高法官的整体素质.     

隐私与隐私权探析

隐私是一种客观事实,具有客观性、相对性、非关联性、非褒贬性四个特征。认定隐私的标准是是否与他人利益和公共利益相关,这是一个客观的标准并不包括权利主体“不愿公开”的主观因素。隐私权是一种支配权,它包括隐私隐瞒权、隐私利用权、隐私维护权和隐私支配权四项权能。坚持隐私认定的客观标准,隐私权与知情权之间并不存在实质性的冲突。     

关于外汇期货套期保值比率的实证研究

最佳套期保值比率(OHR)的估计方法一直是金融工程理论研究的核心问题,从最开始的幼稚法到JSE法 以及随后的很多其他改进方法,保值效率都有不同程度的提高。使用包含误差修正结构的GARCH模型估计外汇 (澳大利亚元)期货的套期保值比率。通过效率比较,证实该模型所得到的套期保值比率比起传统方法都具有更好 的降低风险能力。     

利用光敏核不育性进行水稻轮回选择的程序探讨

本文对利用光敏核不育性进行水稻轮回选择进行了探讨。提出基本轮回选择方案和综合轮回选择方案。基本轮回选择方案是以一个光敏核不育材料为母本与多个亲本组配构成轮回选择的综合群体,而其后按常规轮回选择法进行育种的方案。综合轮回选择方案是以两个或两个以上的光敏核不育材料作为母体与多个亲本组配,在 F_2代群体中不同质源的优良植株相互交配构成综合群体,其后按基本方案进行的轮回选择。     

交际策略的教学与运用

语言交际教学法的目的是提高学习者的交际能力。然而 ,作为交际能力的一个重要组成部分———策略能力 ,却被教师们忽略。交际策略的可教性依然是个有争议的问题。本文首先陈述交际策略的重要性 ,以便唤起教师的注意力 ;其次 ,分析影响学习者交际策略使用的因素 ;第三部分提出了交际策略的教学方法     

对我国民事主体资格理论的反思

民事主体资格问题不仅存在于民事法律关系中, 同时对其他法律关系也会产生影响。关于这一问题在理论研究中还存在一些缺陷。本文就有关问题提出质疑并进行反思, 以求引起重视, 达到完善我国民事主体资格理论的目的。