Principal point classification: Applications to differentiating drug and placebo responses in longitudinal studies

Principal points are cluster means for theoretical distributions. A discriminant methodology based on principal points is introduced. The principal point classification method is useful in clinical trials where the goal is to distinguish and differentiate between different treatment effects. Particularly, in psychiatric studies where placebo response rates can be very high, the principal point classification is illustrated to distinguish specific drug responders from non-specific placebo responders.     

开创上海经济和信息化发展新局面

上海产业经济和信息化发展必须围绕改革的主线,准确把握国内外发展环境的变化,加快转变战略思路和发展方式;要基于需求分析明确发展方向,基于市场机制推进专项行动,基于分类管理推进改革创新,促进上海产业经济走高端化、集约化、服务化发展道路,进一步发挥信息化和智慧城市建设的引领带动作用;要坚持发挥市场在资源配置中的决定性作用,把握价值规律,建立市场规则,完善价格机制,使市场供给能满足、适应和创造市场需求,最大限度地激发市场化活力,进一步解放和发展社会生产力;必须加快推进＂创新驱动、转型发展＂,构建新型产业体系,打造上海经济和信息化升级版,积极探索新型工业化、信息化、城镇化融合发展之路。     

房地产预警指标体系及综合预警方法研究

 本文在对常用的房地产预警指标体系选择方法及筛选流程进行分析的基础上,提出了一种主、客观相结合的房地产预警指标选择方法,即先采用综合分析方法对指标进行初次选择,然后用聚类分析和相关分析相结合的方法进行再次选择。最后建立了武汉市房地产预警指标系统,并进行了房地产综合预警。     

Proactive international strategies of cluster SMEs

In this conceptual paper, proactive international strategies of small- and medium-sized enterprises (SMEs) in the cluster context are discussed. The majority of cluster SMEs assume passive roles as network participants in the process of internationalisation. However, a smaller fraction adopts proactive strategies to foreign expansion acting as leaders of networks. SMEs as network leaders are embedded in the source clusters and dependent on local networks that provide them with complementary resources. We assert that this mutual dependence between a firm's resources and the development of industrial agglomeration should be reflected in the strategic options that SMEs adopt when going international. This paper contributes by synthesising and evaluating a comprehensive range of SME-strategic options and by proposing the proactive competitive strategies of SMEs in the international arena that are both feasible and effective. The feasibility of adopting a specific strategy means the suitability for this group of companies, considering their characteristics. The evaluation of the effectiveness of each strategy was performed according to the objectives of avoiding lock-in and of protecting and developing the core competencies embedded in cluster networks. We address the research gap in evaluating the outcomes of SME international strategies and in synthesising a comprehensive range of cluster SMEs' strategic options.     

要素匹配与中国投资效率空间差异性——基于双层嵌套型函数的分解研究

本文基于四要素双层嵌套的生产函数,利用1990-2016年全国层面及省际层面数据测算投资效率,并分析其空间结构特征及演变轨迹,检验投资效率匹配效应影响因素。研究发现：①1990-2016年我国整体投资效率呈下降趋势,资本-技能劳动匹配效应与整体投资效率走势趋同,快速累积的资本存量和不断升级的资本质量与短缺的技能劳动之间矛盾突出。②东中西部地区投资效率增长非一致性明显。东部地区资本相对投资效率明显高于中西部,但下降幅度大于中西部,中西部与东部地区之间差距缩小,其中匹配效应是区域间投资效率非平衡的主要成因。③若产业结构升级的技能劳动需求不能满足,将引发要素错配,不利于有效投资。房价与工资提升分别通过影响技能劳动供给和需求抑制要素匹配效率;教育和公路设施会对地区要素匹配产生积极影响,改善地区间投资效率非均衡性;地区投资效率存在显著正向空间相关性,毗邻地区的要素流动和经济发展相近地区的技术溢出均对投资效率产生积极的影响。     

加入WTO后的中国经济及日本的对策

虽然东亚产业分布正从"一极集中"到"多极分散",中国东部沿海也在迅速崛起,但笔者依然反对"中国威胁论",认为中国实行的是"非完全、彻底的"市场化,且沿海地区的迅速发展不能代替说明整个中国的发展。与此同时,加入WTO之后会对中国经济和世界经济产生深远的影响,并将成为日本及其国民真正迈向国际化的契机。日本要想有效地利用好中国的优势,一方面应与中国地方政府合作,支持本地中小企业的对外发展,另一方面必须大力推进内部国际化。     

我国工业设计教育的若干问题分析

本文分析和总结了我国工业设计教育发展中的主要问题,并将其归纳为两大类：教育观念和管理模式的问题及教学内容和方法的问题,从中可以清楚地认识到我国工业设计教育的现状,为将来工业设计教育的改革提供参考。     

Public Concern About Industrial Hazards

In this paper we propose adopting a noncognitive perspective for the understanding of people's anxiety or, its opposite, feelings of security about living near hazardous industrial facilities. Results of our empirical investigations among residents of a heavily industrialized area indicate that at least four qualitatively different response patterns exist: the Secure, the Accepting, the Defensive, and the Vigilant response. In this order manifest anxiety increases, which increase is shown to be a function of the assessment of the threat, of the opportunities for personal control (specific), and of hope (generalized) to bring about a better environment by one's own action. As an application of the usefulness of this typology we discuss the various explanations for the often-observed male/female difference in anxiety regarding industrial threat.     

A Note on the Poisson Likelihood Ratio Test Statistic for Kulldorff's Scan Methods

Methods based on scan statistics are widely used in health-related applications to detect clusters of disease. The most common methods are based on the Bernoulli and Poisson models. Kulldorff (1997 Kulldorff , M. ( 1997 ). A spatial scan statistic . Communications in Statistics—Theory and Methods 26 : 1481 – 1496 .[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]) derived the likelihood ratio test statistic for his scan method for both of these models. His scan statistic is widely used with freely available software, SaTScan^? (see Kulldorff, 2005 Kulldorff , M. ( 2005 ). SaTScan: software for the spatial, temporal, and space-time scan statistics , version 5.1 [computer program]. Information Management Services 2005; Available: http://www.satscan.org/. Accessed July 2007 . [Google Scholar]). We provide an alternative derivation of the likelihood ratio test statistic in the Poisson case. Our derivation is simpler and more general in the sense that it applies when the incidences are not aggregated into subregional counts.     

Linear Subspace Spanned by Principal Points of a Mixture of Spherically Symmetric Distributions

For each positive integer k, a set of k-principal points of a distribution is the set of k points that optimally represent the distribution in terms of mean squared distance. However, explicit form of k-principal points is often difficult to obtain. Hence a theorem established by Tarpey et al. (1995 Tarpey , T. , Li , L. , Flury , B. D. ( 1995 ). Principal points and self-consistent points of elliptical distributions . Ann. Statist. 23 : 102 – 112 .[Crossref], [Web of Science ®] , [Google Scholar]) has been influential in the literature, which states that when the distribution is elliptically symmetric, any set of k-principal points is in the linear subspace spanned by some principal eigenvectors of the covariance matrix. This theorem is called a “principal subspace theorem”. Recently, Yamamoto and Shinozaki (2000b Yamamoto , W. , Shinozaki , N. ( 2000b ). Two principal points for multivariate location mixtures of spherically symmetric distributions . J. Japan Statist. Soc. 30 : 53 – 63 .[Crossref] , [Google Scholar]) derived a principal subspace theorem for 2-principal points of a location mixture of spherically symmetric distributions. In their article, the ratio of mixture was set to be equal. This article derives a further result by considering a location mixture with unequal mixture ratio.