Developments in Survey Research over the Past 60 Years: A Personal Perspective

Many developments have occurred in the practice of survey sampling and survey methodology in the past 60 years or so. These developments have been partly driven by the emergence of computers and the continuous growth in computer power over the years and partly by the increasingly sophisticated demands from the users of survey data. The paper reviews these developments with a main emphasis on survey sampling issues for the design and analysis of social surveys. Design‐based inference based on probability samples was the predominant approach in the early years, but over time, that predominance has been eroded by the need to employ model‐dependent methods to deal with missing data and to satisfy analysts' demands for survey estimates that cannot be met with design‐based methods. With the continuous decline in response rates that has occurred in recent years, much current research has focused on the use of non‐probability samples and data collected from administrative records and web surveys.     

Price delay and post-earnings announcement drift anomalies: The role of option-implied betas

In this study, we used informational advantage in the options market to investigate whether the option-implied equity risk developed by Chen, Chung, and Tsai (2016) - viewed as a type of time-varying beta - can help explain both the Hou and Moskowitz (2005) price delay premium and post-earnings announcement drift (PEAD). Our empirical results revealed a clear association between quintile portfolios with greater price delay premiums and higher option-implied betas, while the Fama-MacBeth regressions showed that the implied betas are positively related to future delay-based portfolio returns. Regarding the PEAD, we discerned a general increase in the mean of portfolio option-implied betas with standardized unexpected earnings portfolio drift. Our regression results support the notion that a portfolio’s PEAD can be viewed as compensation for the variations in option-implied betas.     

北斗星基增强系统的精确性研究

介绍北斗卫星导航系统的现状以及北斗卫星星基增强系统的工作原理.研究影响卫星导航精度定位的主要来源,确定有3种误差源,分别为卫星钟差、对流层延迟误差、电离层延迟误差.在此之后,对影响定位精度最主要的误差源——电离层延迟进行分析.针对电离层误差提出格网电离层模型的优化算法并通过数据采集和算法仿真对比得到较好的优化模型.通过仿真结果对比证明了优化算法能够有效降低电离层误差值.     

Mountain-to-sea ecological-resource management: Forested watersheds,coastal aquifers,and groundwater dependent ecosystems

Improving the understanding of connections spanning from mountain to sea and integrating those connections into decision models have been increasingly recognized as key to effective coastal resource management. In this paper, we aim to improve our understanding of the relative importance of linkages between a forested watershed, a coastal groundwater aquifer, and a nearshore marine groundwater-dependent ecosystem (GDE) using a dynamic groundwater optimization framework and simple ecosystem equations. Data from the Kīholo aquifer on the Kona Coast of Hawai‘i Island are used to numerically illustrate optimal joint management strategies and test the sensitivity of those strategies to variations in physical and behavioral parameter values. We find that for a plausible range of watershed management costs, protecting part of the recharge capture area is always optimal. Without watershed protection, maintaining a safe minimum standard growth rate for a GDE-dependent marine indicator species, reduces net present value non-trivially, but optimal investment in watershed conservation offsets that potential reduction by 75 %. In general, we find that optimal watershed management and groundwater pumping are most sensitive to changes in water demand growth and parameters that describe nearshore salinity.     

中国摆脱依附式发展与中美贸易冲突根源

中美贸易冲突根源的探寻不应停留在国际贸易层次,而是应该从当下的国际分工结构和国际生产关系中去寻找。作者从马克思主义国际政治经济学角度出发,认为国际分工及其相应的国际生产关系是决定国家在世界舞台上政治经济地位与利益的基础。发展中国家在传统的国际分工结构中长期处于外围、在生产关系上处于依附地位的根本原因在于生产力落后,特别是技术水平落后。20世纪70年代以来,全球生产链作为一种新的国际生产组织方式逐渐形成并发展起来。在这一新的国际分工生产中,发展中国家的依附地位并没有改变,但是具体的依附形式不同于历史上的依附形式,呈现出“技术—市场”依附的特点。在这种新的依附形式下,广大参与全球生产链分工的发展中国家只能从中获得微薄的附加值,进而形成一种依附式发展,而西方发达国家的跨国企业却能够主导全球生产进程并从中获得高额的附加值。中国要实现现代化强国的目标,就需要摆脱依附式发展模式,实现在全球生产链中从中低端向中高端的攀升。近年来中国在发展高新技术产业和提升世界市场地位方面的努力及其获得的相应成就触动了美国作为现有国际分工主导者的既得利益。为了维护其霸权的经济基础,美国不惜发起贸易战以遏制中国的发展有其必然性。中国摆脱依附式发展以及美国相对衰落所导致的国际分工格局现实和潜在的变化正是中美贸易冲突爆发的根源所在。     

Financial Frictions,Investment Delay,and Asset Market Interventions

We construct a dynamic macro model to incorporate financial frictions and investment delay. Investment is undertaken by entrepreneurs who face liquidity frictions in the equity market and a collateral constraint in the debt market. After calibrating the model to the U.S. data, we quantitatively examine how aggregate activity is affected by a shock to equity liquidity and a shock to entrepreneurs' borrowing capacity. We then analyze the effectiveness of government interventions in the asset market after such financial shocks. In particular, we compare the effects of government purchases of private equity and of private debt in the open market. In addition, we examine how these effects of government interventions depend on the option to delay investment.     

外语经济对我国经济发展的影响

外语经济是以他国语言为核心,以价值观、思维方式和行为准则的最佳融合为对象,以掌握和运用外语与母语在经济领域的内涵差异为目标的经济,研究其融合度,以寻求对外经济利益最大化。外语经济对我国经济发展速度和质量具有重要影响。     

Herding,trend chasing and market volatility

We introduce a heterogeneous agent asset pricing model in continuous-time to show that, although trend chasing, switching and herding all contribute to market volatility in price and return and to volatility clustering, their impacts are different. The fluctuations of the market price and return and the level of the significant autocorrelations (ACs) of the absolute and squared returns increase with the intensities of herding and trend chasing based on long time horizon. However an increase in switching intensity reduces the return volatility and in particular a low switching intensity reduces the price volatility and increases the level of the significant ACs, but the effect becomes opposite when the switching intensity is high. We also show that market noise plays a more important role than fundamental noise on the power-law behavior of returns.     

A generalization of the Binomial distribution based on the dependence ratio

We propose a generalization of the Binomial distribution, called DR‐Binomial, which accommodates dependence among units through a model based on the dependence ratio (Ekholm et al., Biometrika, 82, 1995, 847). Properties of the DR‐Binomial are discussed, and the constraints on its parameter space are studied in detail. Likelihood‐based inference is presented, using both the joint and profile likelihoods; the usefulness of the DR‐Binomial in applications is illustrated on a real dataset displaying negative unit‐dependence, and hence under‐dispersion compared with the Binomial. Although the DR‐Binomial turns out to be a reparameterization of Altham's Additive‐Binomial and Kupper–Haseman's Correlated‐Binomial distribution, we believe its introduction is useful, both in terms of interpretability and mathematical tractability and in terms of generalizability to the Multinomial case.     

A study on the impact of airline service delays on emotional reactions and customer behavior

This study is intended to identify the influence of service delays on emotional responses and customer behavior. For this research, a survey was conducted on airline passengers that experienced service delays. A total of 395 respondents were analyzed using structural equation modeling. According to the analysis results, service delays positively influenced negative emotions and negatively influenced repurchase intention. In addition, service delays positively influenced negative word-of-mouth. This study provides a basic knowledge on how airlines can develop their service strategies to make good use of the motivating effect of service delays on emotional responses and behavioral intentions.