Estimating the error distribution function in semiparametric additive regression models

We consider semiparametric additive regression models with a linear parametric part and a nonparametric part, both involving multivariate covariates. For the nonparametric part we assume two models. In the first, the regression function is unspecified and smooth; in the second, the regression function is additive with smooth components. Depending on the model, the regression curve is estimated by suitable least squares methods. The resulting residual-based empirical distribution function is shown to differ from the error-based empirical distribution function by an additive expression, up to a uniformly negligible remainder term. This result implies a functional central limit theorem for the residual-based empirical distribution function. It is used to test for normal errors.     

对中国各地区能源强度空间影响的实证研究

运用莫兰指数考察了地区能源强度的空间自相关性,并在能源要素禀赋差距指标和地理邻近矩阵的基础上创建了一个空间计量权重矩阵。通过Matlab7.0的空间计量工具箱,分别运用空间滞后面板数据模型和空间误差面板数据模型对中国地区间能源强度的空间效应进行了实证检验,结果证明了空间聚集效应的存在,邻近地区的能源强度确实会对目标地区的能源强度产生影响。     

Multivariate non-linear time series modelling of exposure and risk in road safety research

Summary.  A multivariate non-linear time series model for road safety data is presented. The model is applied in a case-study into the development of a yearly time series of numbers of fatal accidents (inside and outside urban areas) and numbers of kilometres driven by motor vehicles in the Netherlands between 1961 and 2000. The model accounts for missing entries in the disaggregated numbers of kilometres driven although the aggregated numbers are observed throughout. We consider a multivariate non-linear time series model for the analysis of these data. The model consists of dynamic unobserved factors for exposure and risk that are related in a non-linear way to the number of fatal accidents. The multivariate dimension of the model is due to its inclusion of multiple time series for inside and outside urban areas. Approximate maximum likelihood methods based on the extended Kalman filter are utilized for the estimation of unknown parameters. The latent factors are estimated by extended smoothing methods. It is concluded that the salient features of the observed time series are captured by the model in a satisfactory way.     

Slack-variable models versus Scheffé's mixture models

Slack-variable models are compared against Scheffé's polynomial model for mixture experiments. The notion of model equivalence and the use of various diagnostic measures provide effective tools in making such comparisons, particularly when the experimental region is highly constrained. It is demonstrated that the choice of the best fitting model, through variable selection, depends on which mixture component is selected as a slack variable, and on the size of the fitted model. In addition, the equivalence of two well-known representations of a complete mixture model is shown to be valid. Two numerical examples are presented.     

中国城市空间营造思想演变研究

中国的城市空间营造思想随着时代的发展变迁分为五个阶段,首先是1859年之前的古代阶段,这一阶段的主导思想是中国传统的礼制思想;第二阶段是1859—1949年,这一阶段是中国传统礼制和西方营造思想之间的相互融合;第三阶段是1949—1979年,这一阶段是在政府威权影响下的城市空间营造;第四阶段是1979—2009年,这一阶段是市场经济影响下的城市空间营造;第五阶段是2009年以及之后的中国,这一阶段将是多元文化和价值观认同下的城市空间营造。     

油气储量资产与油气资产辨析及其价值计量研究

从会计实务及理论上辨析油气储量资产与油气资产内涵。油气储量资产的关键问题是其历史成本与价值的巨大差异性,公允价值计量是提供高质量油气会计信息的一种方法,但是实现尚有障碍;国际上关于油气资产公允价值计量运用条件满足性研究仍在进行中;历史成本下补充信息披露内容及方式也值得探讨。     

试论河湟地区的民族地理学研究意义

"河湟"地区是中国西北多元民族文化共生的典型区域。"以水为据"梳理该地区少数民族聚落的分布特征,为该地区民族地理学研究提供了新的视角。河湟地区多元文化反映了西北民族文化分布格局,少数民族人口的时空变迁,少数民族文化与自然环境间的调试关系等,对于研究民族文化地理空间具有重要价值。河湟地区是整个西北民族走廊的重要组成部分,对于整个汉藏边界民族文化研究具有典型意义。     

以公共艺术规划推进城市人文景观体系构建

公共艺术是城市人文景观的重要内容,发达国家和地区的公共艺术在推动人居环境的人文景观构建方面有许多优秀案例和成功经验。公共艺术规划是构建城市人文景观体系的重要措施,在城市公共空间和园林绿地建设中将公共艺术纳入专项规划存在必要性。本文分析了我国当前城市公共艺术规划的实践,探讨了公共艺术规划的工作框架,规划的性质、实施主体与参与方式;指出构建城市公共艺术人文景观体系对塑造城市人文内核和地域特色的重要性。     

不可分的直观——康德数学哲学浅析

在20世纪关于数学基础的争论当中,直觉主义流派往往将康德认作是其理论的鼻祖。然而,回到解析几何与微积分诞生不久的18世纪,康德所提出的“纯粹数学是如何成为可能的问题”,并不容易被已经惯用这两种数学工具的现代人所理解。本文拟通过对“这个问题是如何提出的、为了解决这个问题康德所提出的猜想、康德怎样证明这个猜想”三个方面的分析,来理解康德所提出的这个问题的含义。从中可以看到,“不可分的直观”成为康德数学哲学区别于其他数学哲学流派的核心概念。     

委托资产组合管理研究综述

从委托资产组合管理中的最优报酬合同、声誉对管理者的影响及资产定价和一般均衡三个方面综述有关委托资产组合管理的研究现状,剖析该领域的最新发展,并提出至今未解决的问题,进而有针对性地提出需要进一步研究的内容。