Jackknifing the Ridge Regression Estimator: A Revisit

Singh et al. (1986 Singh, B., Chaubey, Y.P., Dwivedi, T.D. (1986). An almost unbiased ridge estimator. Sankhya B48: 34236. [Google Scholar]) proposed an almost unbiased ridge estimator using Jackknife method that required transformation of the regression parameters. This article shows that the same method can be used to derive the Jackknifed ridge estimator of the original (untransformed) parameter without transformation. This method also leads in deriving easily the second-order Jackknifed ridge that may reduce the bias further. We further investigate the performance of these estimators along with a recent method by Batah et al. (2008 Batah, F. S.M., Ramanathan, T.V., Gore, S.D. (2008). The efficiency of modified Jack-knife and ridge type regression estimators: a comparison. Surv. Math. Applic. 3:111122. [Google Scholar]) called modified Jackknifed ridge theoretically as well as numerically.     

企业的社会责任与人力资源管理创新

SA8000进入我国已有4年多时间,但我国企业并没有多大的认证兴趣,甚至很多企业根本就不知道这一标准的存在。我国企业应该认清SA8000是企业承担社会责任的初级标准选择,并且应该积极主动地去承担;企业要制定相应的人力资源管理战略,支撑企业承担社会责任的战略目标;企业要依据SA8000标准,对人力资源管理职能流程链进行改进和提升,使企业承担社会责任落实到实处。     

论知识经济时代的工商管理本科教育创新

知识经济时代的到来,对人们社会生活方式和思维方式产生重大的影响,并对传统的工商管理本科教育理念、教学组织、教学方式、教学内容、教学过程、教学手段产生巨大的冲击。面对知识经济的这种要求和21世纪的时代特点,我国传统的工商管理本科教育模式是难以适应的,必须更新观念,研究未来社会对工商管理人才知识、能力和素质结构的要求,改变人才培养模式,建立通才和专才并举,知识、能力与素质结合的工商管理现代人才培养模式,进行工商管理本科教育的创新。     

Vector and recurrent singular spectrum analysis: which is better at forecasting?

Singular spectrum analysis (SSA) is an increasingly popular and widely adopted filtering and forecasting technique which is currently exploited in a variety of fields. Given its increasing application and superior performance in comparison to other methods, it is pertinent to study and distinguish between the two forecasting variations of SSA. These are referred to as Vector SSA (SSA-V) and Recurrent SSA (SSA-R). The general notion is that SSA-V is more robust and provides better forecasts than SSA-R. This is especially true when faced with time series which are non-stationary and asymmetric, or affected by unit root problems, outliers or structural breaks. However, currently there exists no empirical evidence for proving the above notions or suggesting that SSA-V is better than SSA-R. In this paper, we evaluate out-of-sample forecasting capabilities of the optimised SSA-V and SSA-R forecasting algorithms via a simulation study and an application to 100 real data sets with varying structures, to provide a statistically reliable answer to the question of which SSA algorithm is best for forecasting at both short and long run horizons based on several important criteria.     

中小民营企业融资渠道现状与特征探析——以广东实证分析为例

根据中国人民银行广州分行课题组的调查结果,从现有融资渠道及其结构状况与特点、不同资产规模企业的融资渠道结构差异比较、不同地区企业的融资渠道结构差异比较三个角度对广东中小民营企业融资渠道的状况与特征进行实证分析。结果表明广东省中小民营企业融资难问题突出表现在:短期资金融资难度降低,但长期权益性资本严重短缺;中小民营企业中做大的企业融资困难得到缓解,但中小企业融资仍十分困难;发达地区资金相对充足,欠发达地区中小民营企业融资更为困难。     

Is there a causal relationship between oil prices and tourist arrivals?

This application note investigates the causal relationship between oil price and tourist arrivals to further explain the impact of oil price volatility on tourism-related economic activities. The analysis itself considers the time domain, frequency domain and information theory domain perspectives. Data relating to US and nine European countries are exploited in this paper with causality tests which include time domain, frequency domain, and Convergent Cross Mapping (CCM). The CCM approach is nonparametric and therefore not restricted by assumptions. We contribute to existing research through the successful and introductory application of an advanced method, and via the uncovering of significant causal links from oil prices to tourist arrivals.     

融资结构失衡与企业债券融资发展

我国融资结构中突出的问题是企业债券融资发展滞后。发展企业债券不仅是融资方式多元化的要求 ,而且能克服过分依赖银行所带来的缺陷。阻碍企业债券发展的因素主要是政府管制、企业素质低下、市场环境欠缺以及企业债券市场自身的问题等。加快企业债券融资发展要从完善市场机制和健全微观结构着手。     

From social control to financial economics: the linked ecologies of economics and business in twentieth century America

This article draws on historical material to examine the co-evolution of economic science and business education over the course of the twentieth century, showing that fields evolve not only through internal struggles but also through struggles taking place in adjacent fields. More specifically, we argue that the scientific strategies of business schools played an essential—if largely invisible and poorly understood—role in major transformations in the organization and substantive direction of social-scientific knowledge, and specifically economic knowledge, in twentieth century America. We use the Wharton School as an illustration of the earliest trends and dilemmas (ca. 1900–1930), when business schools found themselves caught between their business connections and their striving for moral legitimacy in higher education. Next, we look at the creation of the Carnegie Tech Graduate School of Industrial Administration after World War II. This episode illustrates the increasingly successful claims of social scientists, backed by philanthropic foundations, on business education and the growing appeal of “scientific” approaches to decision-making and management. Finally, we argue that the rise of the Graduate School of Business at the University of Chicago from the 1960s onwards (and its closely related cousin at the University of Rochester) marks the decisive ascendancy of economics, and particularly financial economics, in business education over the other behavioral disciplines. We document the key role of these institutions in diffusing “Chicago-style” economic approaches—offering support for deregulatory policies and popularizing narrowly financial understandings of the firm—that sociologists have described as characteristic of the modern neo liberal regime.     

广州金融服务业发展的现状与政策探讨

广州市确立“金融强市”发展战略以来,现已初步形成区域性金融决策中心、管理中心、运营中心和资金集散中心的地位。经济金融全球化、金融强省战略、广州经济发展、广州现代化大都市建设等都为广州金融服务业进一步发展带来机遇,同时,经济金融全球化及我国金融业全面开放以及内部发展的不足对广州金融业发展带来了新的挑战。如果能够抓住当前金融改革发展的契机,由政府主导和推动,提供优惠政策和制度环境,完全可以在较短时间内超前发展,加快金融中心的建设。     

Alcohol,Sex, and Screens: Modeling Media Influence on Adolescent Alcohol and Sex Co-Occurrence

Alcohol use and sexual behavior are important risk behaviors in adolescent development, and combining the two is common. The reasoned action approach (RAA) is used to predict adolescents’ intention to combine alcohol use and sexual behavior based on exposure to alcohol and sex combinations in popular entertainment media. We conducted a content analysis of mainstream (n = 29) and Black-oriented movies (n = 34) from 2014 and 2013–2014, respectively, and 56 television shows (2014–2015 season). Content analysis ratings featuring character portrayals of both alcohol and sex within the same five-minute segment were used to create exposure measures that were linked to online survey data collected from 1,990 adolescents ages 14 to 17 years old (50.3% Black, 49.7% White; 48.1% female). Structural equation modeling (SEM) and group analysis by race were used to test whether attitudes, norms, and perceived behavioral control mediated the effects of media exposure on intention to combine alcohol and sex. Results suggest that for both White and Black adolescents, exposure to media portrayals of alcohol and sex combinations is positively associated with adolescents’ attitudes and norms. These relationships were stronger among White adolescents. Intention was predicted by attitude, norms, and control, but only the attitude–intention relationship was different by race group (stronger for Whites).