机会成本:决策中不可忽视的因素

机会成本是经济学中的一个重要概念,其应用的范围非常广泛。在经济活动、行政管理和日常生活中都要重视机会成本,权衡成本和收益做出正确的决策。     

公务员招考对象变化对大学生择业观的影响

近年来,中央和各省市公务员招考条件出现了一个共同的变化,即中央和省市公务员面向应届毕业生招考的比例越来越小,同时更多的招考职位面向有基层工作经验的人员,一部分职位开始面向工人和农民,还有部分职位定向招录基层服务项目的毕业生。这一显著变化势必影响毕业生的就业选择和择业观。通过对近年来公务员招录条件的这一变化对大学生择业观...     

随机利率下两类奇异期权定价的偏微分方程方法

采用偏微分方程的方法研究扩展型Vasicek模型下两类奇异期权的定价问题,利用无套利原理推导出所满足的偏微分方程,通过求解这个偏微分方程得到了两类奇异期权的定价公式.     

高校体育教师课程意识的研究

高校体育教师课程意识是高校体育课程开发和实施的前提,直接影响着《全国普通高等学校体育课程教学指导纲要》的实施.高校体育教师应具备的课程意识包括：课程参与意识、课程重构意识、课程研究意识、课程创新意识、课程开放意识、课程控制意识、课程评价意识.高校要积极营造增强体育教师课程意识的环境氛围,切实转变课程观,认真贯彻和落实新的体育课程标准,培养体育教师课程创新能力.     

A generalization of exotic options pricing formulae

INTRODUCTION The valuation and hedging of the ever increasing number of exotic options, is a topic that interests many practitioners seeking to answer their customer’s need to hedge risk (in particular in the foreign ex- change markets). Exotic options, or “path-dependent” options, such as compound options, reset options and Barrier options and the like, are options whose payoff depends on the behavior of the price of the underlying between 0 and the maturity (assumed to be fixed), rath…     

景颇语谓语人称标记的多选择性

本文通过景颇语句尾词的语义、语法特点的分析,试图说明景颇语谓语的人称标记与主语之间不是简单的一对一的关系,而是为了增强、扩大句子的语言表达功能而生成的一种语义、语法手段,具有多选择性、多功能性的特点。     

试论我国市场体系与世贸组织要求的差距及对策

作为世界贸易组织的一员 ,既要按照世界贸易组织的有关规定享受其权利 ,也要承担相应的义务。但目前我国市场体系与世界贸易组织的要求相比 ,仍存在着比较大的差距。对此 ,我国应采取积极有效的措施来促进国内市场与国际市场的接轨 ,真正完善我国的市场体系     

Effect of number of response options on the psychometric properties of Likert-type scales used with children

Although Likert-type rating scales are used in a great number of early childhood studies, knowledge of how the number of response options affects the psychometric properties of scales used with children is limited. The purpose of this study is to contribute to this knowledge. Data were collected from second grade students and third grade students. Accordingly, 1,092 second- and third-graders completed a 2-point, 3-point, and 4-point version of the School Attachment Scale for Children and Adolescents. Participants came from 11 schools, different in terms of socioeconomic status. The children received the versions approximately three weeks apart. Results revealed that as the number of response options increased, the means tended to decrease and the distribution to be normal. For the 2-point version, most items were below the cut-off point in terms of discrimination indexes. Compared to the 2-point version, there was a significant increase in discrimination indexes for the 3- and 4-point versions, and the items’ discrimination indexes were high. It was concluded that the reliability coefficient increased with an increasing number of response options for all subdimensions of the scale. When the validity estimations of the three subdimensions were examined for the three versions of the scale, it was found that the 3- and 4-point versions were appropriate for the validity and that the validity of the 2-point version was weak. It was observed that using 2-point Likert-type scales with children negatively affected the psychometric properties and that these properties improved with an increased number of response options.     

An Environmental Scan of OCLC Alternatives: A Management Perspective

OCLC’s WorldCat now holds more than 320 million bibliographic records with some 2-plus billion holdings linked to the bibliographic records. The vast majority of the world’s libraries, archives, and museums rely on OCLC as the primary source for bibliographic records. Compared to all other options, OCLC is clearly the very large elephant in the room. OCLC provides a broad range of services, including WorldShare Metadata Services (cataloging); WorldShare Interlibrary Loan (sharing resources); WorldShare Management Services (cloud-based integrated library system); WorldCat Discovery Services; and CONTENTdm? (management of digital collections). This article explores the available options for obtaining cataloging records from alternative sources by considering four factors: breadth, quality, ease of use, and costs of use of the bibliographic database.     

定价多资产美式期权的半线性Black-Scholes偏微分方程的唯一解

In this paper, by using the optimal stopping theory, the semilinear Black-Scholes partial differential equation （PDE） was invesigated in a fixed domain for valuing two assets of American （call-max/put-min） options. From the viscosity solution of a PDE, a unique viscosity solution was obtained for the semilinear Black-Scholes PDE.