Efficient Estimation of a Distribution Function under Quadrant Dependence

LetX₁,X₂, ..., be real-valued random variables forming a strictly stationary sequence, and satisfying the basic requirement of being either pairwise positively quadrant dependent or pairwise negatively quadrant dependent. LetF^ be the marginal distribution function of theX_ips, which is estimated by the empirical distribution functionF_n and also by a smooth kernel-type estimateF_n, by means of the segmentX₁, ...,X_n. These estimates are compared on the basis of their mean squared errors (MSE). The main results of this paper are the following. Under certain regularity conditions, the optimal bandwidth (in the MSE sense) is determined, and is found to be the same as that in the independent identically distributed case. It is also shown thatn MSE(F_n(t)) andnMSE (F^_n(t)) tend to the same constant, asn→∞ so that one can not discriminate be tween the two estimates on the basis of the MSE. Next, ifi(n) = min {k∈{1, 2, ...}; MSE (F_k(t)) ≤ MSE (F_n(t))}, then it is proved thati(n)/n tends to 1, asn→∞. Thus, once again, one can not choose one estimate over the other in terms of their asymptotic relative efficiency. If, however, the squared bias ofF^_n(t) tends to 0 sufficiently fast, or equivalently, the bandwidthh_n satisfies the requirement thatnh³_n→ 0, asn→∞, it is shown that, for a suitable choice of the kernel, (i(n) ?n)/(nh_n) tends to a positive number, asn→∞ It follows that the deficiency ofF_n(t) with respect toF^_n(t),i(n) ?n, is substantial, and, actually, tends to ∞, asn→∞. In terms of deficiency, the smooth estimateF^_n(t) is preferable to the empirical distribution functionF_n(t)     

中国西部开发与美国西部开发的对比研究

通过对美国西部开发和中国西部开发的对比及借鉴美国西部的经济开发策略,对中国西部的经济发展提出了采取“梯度转移”与有条件的“增长极核发展”相结合的经济发展战略模式的建议。     

Flow shop scheduling with deteriorating jobs under dominating machines

This paper addresses no-wait or no-idle flow shop scheduling problems with deteriorating jobs, i.e., jobs whose processing times are an increasing function of their starting time. A simple linear deterioration function is assumed and some dominating relationships between machines can be satisfied. It is shown that for the problems to minimize makespan or weighted sum of completion time, polynomial algorithms still exist, although these problems are more complicated than the classical ones. When the objective is to minimize maximum lateness or maximum tardiness, the solutions of a classical version may not hold.     

施工索赔机会发现的描述与求解方法

施工索赔机会发现是索赔管理的核心和关键内容,是索赔决策的瓶颈环节。分析了施工索赔机会发现的信息结构,给出了其灰描述,研究了施工索赔机会发现的两种求解方法,研究了索赔机会发现支持系统的工作机制。     

国有股和法人股对公司业绩的影响--公用事业型上市公司的实证研究

公司的股份集中于少数几个大股东手中是中国公司股权结构的一个普遍特征,研究这些大股东如何凭借其持股地位影响公司业绩是中国公司股权结构研究的一个非常重要的问题.本文选取了在上交所上市的公用事业型公司1998年至2002年的平行数据进行实证研究,结果表明,法人股对公司业绩有积极影响,国有股对公司业绩的影响视具体情况而定.     

改革开放40年我国高中阶段教育政策的价值变迁

高中阶段教育是世界各国制定教育规划时共同的关注焦点,也是我国义务教育向高等教育过渡的关键节点。改革开放以来,我国高中阶段教育政策从注重单方面质、量的平行发展到兼顾质与量的统筹发展,再到回归个体本身的个性发展,从关注学生的外部属性再深化到内部属性,价值取向处在逐步演进中,由最初的社会本位取向转变为大众主义取向,紧接着体现出以人为本取向,深刻反映了时代变化与发展的诉求。     

社会自主性的三种提升路径

社会自主性是现代化进程中的重要一维,社会自主性对市场侵蚀的抵抗和对国家权力的制约有利于形成均衡性的治理结构。现代化进程的历史维度、关系范畴的相对维度和治理现代化的功能维度构成理解社会自主性的3种视角。中国经由长期历史沉淀形成的是国家本位主义传统,改革开放打破了国家-社会的同构状态并塑造了一个相对自主的社会。中国社会缺乏自治机制的文化土壤和理念基础,社会自主性的提升需要国家以主动塑造方式,通过输入路径、合作路径和培育路径进行治理推动。     

从翻译安全观看“南海仲裁案”新闻翻译及报道

整个“南海仲裁案”新闻报道中,翻译无疑扮演着重要的角色,因而对翻译报道中不尽人意之处有必要作一些反思。从以名举实角度出发,不难发现南海新闻翻译报道明显存在着诸多不足。分析研究表明,媒体对“the Permanent Court of Arbitration”“ruling”“South China Sea”“Scarborough Reef”和“Taiping Rock”等关键性词语翻译欠妥,这样的新闻报道容易造成误会并带来不良后果。基于此,国际新闻报道过程中应提倡树立国家翻译安全观,国际新闻的翻译、编译和摘译等必须讲政治,切不可率尔操觚、张冠李戴或人云亦云。     

Bayesian adjustment for unidirectional misclassification in ordinal covariates

In this paper, we study the identification of Bayesian regression models, when an ordinal covariate is subject to unidirectional misclassification. Xia and Gustafson [Bayesian regression models adjusting for unidirectional covariate misclassification. Can J Stat. 2016;44(2):198–218] obtained model identifiability for non-binary regression models, when there is a binary covariate subject to unidirectional misclassification. In the current paper, we establish the moment identifiability of regression models for misclassified ordinal covariates with more than two categories, based on forms of observable moments. Computational studies are conducted that confirm the theoretical results. We apply the method to two datasets, one from the Medical Expenditure Panel Survey (MEPS), and the other from Translational Research Investigating Underlying Disparities in Acute Myocardial infarction Patients Health Status (TRIUMPH).     

A Bayesian Model and Stochastic Exposure (Dose) Estimation for Relative Exposure Risk Comparison Involving Asbestos‐Containing Dropped Ceiling Panel Installation and Maintenance Tasks

Assessing exposures to hazards in order to characterize risk is at the core of occupational hygiene. Our study examined dropped ceiling systems commonly used in schools and commercial buildings and lay‐in ceiling panels that may have contained asbestos prior to the mid to late 1970s. However, most ceiling panels and tiles do not contain asbestos. Since asbestos risk relates to dose, we estimated the distribution of eight‐hour TWA concentrations and one‐year exposures (a one‐year dose equivalent) to asbestos fibers (asbestos f/cc‐years) for five groups of workers who may encounter dropped ceilings: specialists, generalists, maintenance workers, nonprofessional do‐it‐yourself (DIY) persons, and other tradespersons who are bystanders to ceiling work. Concentration data (asbestos f/cc) were obtained through two exposure assessment studies in the field and one chamber study. Bayesian and stochastic models were applied to estimate distributions of eight‐hour TWAs and annual exposures (dose). The eight‐hour TWAs for all work categories were below current and historic occupational exposure limits (OELs). Exposures to asbestos fibers from dropped ceiling work would be categorized as “highly controlled” for maintenance workers and “well controlled” for remaining work categories, according to the American Industrial Hygiene Association exposure control rating system. Annual exposures (dose) were found to be greatest for specialists, followed by maintenance workers, generalists, bystanders, and DIY. On a comparative basis, modeled dose and thus risk from dropped ceilings for all work categories were orders of magnitude lower than published exposures for other sources of banned friable asbestos‐containing building material commonly encountered in construction trades.