民族主义与韩国外交政策

民族主义作为一种情感归属和价值诉求,大多兴起于社会转型与断裂时期,以其模糊性赢得了广阔的生存空间,其黏合性彰显了巨大的工具价值.现代化推动了当前韩国民族主义的兴起与发展,其主要采取宣扬民族文化优越性、寻求历史荣光与付诸现实政策等建构方式.其间,经过诸多危机事件的碰撞,韩国民族主义逐渐形成了从民族情感到民族意识形态的广泛领域,在现实政策中不断得以强化,并通过对外交决策机制的介入、社会氛围的营造、意识形态的塑造等深刻影响着韩国外交政策.     

马英九大陆政策研究

马英九从政多年,党政历练丰富,作为台湾政坛极其显要的政治人物,其对两岸关系极为重视,特别是出任台湾地方领导人并担任国民党主席后,逐渐形成了一套独具特色的大陆政策,对两岸关系的发展产生了极其重要的作用和深远影响.本文着重就马英九大陆政策的实质内涵、政策特点、作用影响和发展趋势,作一粗浅的研究和分析.     

Investigating Health Selection Within Mexico and Across the US Border

Despite acquiring lower levels of attainment and earnings, Mexican immigrants exhibit favorable health outcomes relative to their native-born counterparts. And while scholars attempt to reconcile this so-called paradoxical relationship with a variety of theoretical and empirical approaches, patterns of selective migration continue to receive considerable attention. The present study contributes to the literature on health selection by extending the healthy migrant hypothesis in a number of ways. First, we rely on a unique combination of datasets to assess whether the healthy are disproportionately more likely to migrate. We use the latest wave of the Mexican Family Life Survey and the 2013 Migrante Study, a survey that is representative of Mexican-born persons who are actively migrating through Tijuana. Pooling these data also allow us to differentiate between internal and US-bound migrants to shed light on their respective health profiles. Results provide modest support for the healthy migrant hypothesis. Although those who report better overall health are more likely to migrate, we find that the presence of certain chronic conditions increases migration risk. Our findings also suggest that internal migrants are healthier than those traveling to the US, though this is largely because those moving within Mexico reflect a younger and more educated population. This study takes an important step in uncovering variation across migrant flows and highlights the importance of the timing at which health is measured in the migration process.     

评分不一致性对在线评论有用性的影响——归因理论的视角

哪些因素会影响在线评论的有用性一直是理论界和实践界都十分关心的问题,但现有研究对在线评论的星级评分是如何影响评论有用性这一问题仍未形成统一的结论。基于此,本文以归因理论为分析框架,构建了在线评论的星级评分与产品的平均星级间的不一致性对评论有用性的影响的研究模型,并重点探讨产品的评论总量以及评论的星级评分和平均星级间差异的方向对这一影响的调节作用。本文以携程网上832233条酒店评论为样本,采用零膨胀负二项回归方法对理论模型进行了实证检验,研究结果表明,评分不一致性对评论的有用性有显著的负向影响,而某种产品的评论总量以及星级评分和平均星级间差异的方向对评分不一致性和评论有用性间的关系起到调节作用。当产品的评论总量越高或评论的星级评分与产品的平均星级间的差异为正向差异时,评分不一致性对评论有用性的负向影响越强。本文的研究成果既为理解在线评论有用性提供了理论贡献,也有助于电子商务或第三方评论网站管理和应用在线评论。     

A link-free sparse group variable selection method for single-index model

For regression problems with grouped covariates, we adapt the idea of sparse group lasso (SGL) [10 J. Friedman, T. Hastie, and R. Tibshirani, A note on the group lasso and a sparse group lasso, Tech. Rep., Statistics Department, Stanford University, 2010. [Google Scholar]] to the framework of the sufficient dimension reduction. Assuming that the regression falls into a single-index structure, we propose a method called the sparse group sufficient dimension reduction to conduct group and within-group variable selections simultaneously without assuming a specific link function. Simulation studies show that our method is comparable to the SGL under the regular linear model setting and outperforms SGL with higher true positive rates and substantially lower false positive rates when the regression function is nonlinear. One immediate application of our method is to the gene pathway data analysis where genes naturally fall into groups (pathways). An analysis of a glioblastoma microarray data is included for illustration of our method.     

Geometry and Degrees of Freedom of Linearly Constrained Generalized Lasso

The least squares fit in a linear regression is always unique even when the design matrix has rank deficiency. In this paper, we extend this classic result to linearly constrained generalized lasso. It is shown that under a mild condition, the fit can be represented as a projection onto a polytope and, hence, is unique no matter whether design matrix X has full column rank or not. Furthermore, a formula for the degrees of freedom is derived to characterize the effective number of parameters. It directly yields an unbiased estimate of degrees of freedom, which can be incorporated in an information criterion for model selection.     

Exact distribution of a modified Behrens–Fisher statistic

The exact distribution of a modified Behrens–Fisher statistic is derived. The distribution function is mostly elementary and is simpler than the exact distribution derived by Nel et al. Its practical use (including computationalefficiency and computational convenience) is discussed.     

技术进步、人力资本与经济增长关系的实证检验

文章采用面板联立方程实证模型(SEM)对技术进步、人力资本与经济增长之间的关系进行研究.借助Stata计量软件,以中国23大城市群的经验数据为样本,将城市群划分为东、中、西三大区域进行实证检验,实证结果与理论推导基本吻合:中国城市群中,技术进步与人力资本间存在相互促进关系.技术进步、人力资本促进经济的增长.     

吉林省推进以人为中心的新型城镇化研究

新型城镇化建设作为我国的一项重要发展战略是普惠民生以及促进国民经济健康可持续发展的重要途径。习近平总书记在党的十八届五中全会上明确提出坚持以人民为中心的发展思想,这在新时期赋予了新型城镇化建设更为深刻的内涵。吉林省作为我国重要的商品粮基地和老工业基地,在新时期面临着经济下行的压力,而推进新型城镇化建设对于促进吉林省经济增长、产业结构调整以及城乡统筹发展具有重大意义。然而近年来在推进新型城镇化建设的过程中出现了城乡居民收入差距加大、城镇化率增长速度缓慢、城镇化建设水平较低、就业结构不合理等一系列问题。这些困境主要是由农业现代化发展缓慢、各地级市差异化的区位特征、体制机制的不健全以及产业结构的不合理等因素造成的。本文提出要推进吉林省的新型城镇化建设,必须坚持以人为中心的发展原则,综合运用创新、协调、绿色、开放、共享的发展理念,以刘易斯二元经济理论为指导,因地制宜地推进吉林省中东西部地区城镇化协调发展,积极发展现代农业,推进城乡协调发展,建立健全体制机制,提升城镇化建设水平,调整产业结构,创新产业发展模式等方式,最终提高吉林省以人为中心的新型城镇化建设水平。     

Combining micro and macro data in hedonic price indexes

This paper proposes arithmetic and geometric Paasche quality-adjusted price indexes that combine micro data from the base period with macro data on the averages of asset prices and characteristics at the index period. The suggested indexes have two types of advantages relative to traditional Paasche indexes: (i) simplification and cost reduction of data acquisition and manipulation; and (ii) potentially greater efficiency and robustness to sampling problems. A Monte Carlo simulation study and an empirical application concerning the housing market illustrate some of those advantages.