Is a pure jump process fitting the high frequency data better than a jump-diffusion process?

Two families of processes: pure jump processes and jump-diffusion processes are widely used in literatures. Recently, empirical findings demonstrate that the underlying processes of high frequency data sets are pure-jump processes of infinite variation in many situations. Statistical tests are also proposed to make the empirical findings theoretically grounded. In this paper, we extend the work of Jing et al. (2012) in two aspects: (1) the jump process in the null hypothesis and the alternative hypothesis could be different; (2) the null hypothesis covers more flexible processes which are more relevant in finance when considering models for asset prices or nominal interest rates. Theoretically, the test is proven to be very powerful and can control the type I error probabilities well under the nominal level.     

高职生人文素质与社会生活能力状况的调查及对策探析

采用了调查问卷、座谈会、实地考察、走访相关学生工作部门等方式，对当代高职生长期社会生活中最实用、最常用、最需要的人文素质进行了调研。通过调研得出了相互印证又尽可能准确、真实、可靠的第一手资料。通过对第一手资料的分析和研究，给出了相应的对策、建议，以期为今后的高职人文素质课程改革提供有力的材料支持。     

论琼南黎族地区中学数学教师培训中的瓶颈问题

通过对琼南黎族地区中学数学教师培训现状的分析,研究了制约教师培训效果的瓶颈问题,分析了产生瓶颈问题的原因,并对突破瓶颈问题的关键进行了探讨。     

Innovation Systems and Systems Development:Innovation Systems and Systems Development:Lessons from History and Prospects for the Future

This paper addresses the question What drives economic growth from a socio-technical perspective.It discusses the concept ofinnovation system,especially at the national level,and its three components: actors and factors,interrelationships and dynamics.Historical examples will be given from eighteenth century England (especially the Watt-Boulton steam engine firm) and the late nineteenth and early twentieth century USA (especially the contribution of Thomas Edison).Lessons are drawn for China,focusing on Har...     

Tests for Unit-Root versus Threshold Specification With an Application to the Purchasing Power Parity Relationship

We consider modeling the real exchange rate by a stationary three-regime self-exciting threshold autoregressive (SETAR) model with possibly a unit root in the middle regime. This representation is consistent with purchasing power parity in the presence of trading costs. Our main contribution is to provide statistical tools for testing unit root versus a SETAR. First, we show that a SETAR with a unit root in the middle regime is stationary and mixing under reasonable assumptions. Second, we derive analytically the asymptotic distribution of our unit-root test under the null. Using monthly real exchange rate data, our test rejects the null of unit-root against a threshold process for five European series.     

党内民主发展的演进轨迹及其基本经验

党内民主是党的生命。新中国成立60年来，党内民主在理论和实践上都取得了一系列辉煌的成就，但仍有一些地方有待完善。因此必须从发展重点、发展策略、发展方向等方面着手进一步推进党内民主的发展。     

体育教学中培养学生创新能力初探

体育教学作为学校教学中极为重要的方面及内容,有着其独特的鲜明特征。从教师素质、想象能力、创新意识和创新动力等方面进行深入分析与探讨,阐述了在体育教学中培养学生创新能力的策略、措施及方法。     

First-exit times for compound poisson processes for some types of positive and negative jumps

We consider the one-sided and the two-sided first-exit problem for a compound Poisson process with linear deterministic decrease between positive and negative jumps. This process (X(t)) _t≥0 occurs as the workload process of a single-server queueing system with random workload removal, which we denote by M/G _u /G _d /1, where G _u (G _d ) stands for the distribution of the upward (downward) jumps; other applications are to cash management, dams, and several related fields. Under various conditions on G _u and G _d (assuming e.g. that one of them is hyperexponential, Erlang or Coxian), we derive the joint distribution of τ _y =inf{t≥0|X(t)?(0,y)}, y>0, and X(τ _y ) as well as that of T=inf{t≥0|X(t)≤0} and X(T). We also determine the distribution of sup{X(t)|0≤t≤T}.     

主体性问题大讨论在“以人为本”思想形成中的地位

20世纪80年代以来关于主体性问题的讨论,在＂以人为本＂的执政理念形成过程中占据着重要地位,产生了巨大作用。对于＂人＂的理解,已在不断地超越旧有的思想倾向,由抽象转向具体,由形式转向内容。     

Of peasants and publics in colonial India: Daduram's story

ABSTRACT

This article uses an exceptionally well-documented law case from the 1650s to offer a fresh perspective on the English experience of Atlantic settlement during its early years. It argues for the centrality of the Essex county quarter sessions court in the building of neighbourhood on the geographic and cultural margins of the Massachusetts Bay colony. By focusing on the north-eastern margin at Cape Ann, the analysis reveals aspects of state building through a common law judicial process which was just as important, but less readily apparent, in other settings. The article addresses three major historiographic areas, engaging with the historical literature on English neighbourhoods and English adaptation to the American environment, on the significance of witchcraft or maleficium in English societies, and on the nature and meanings of law, law courts and judicial process in the building of communities. Case documents also enable the use of some concepts and techniques of literary analysis related to the study of narrative, arguing that judicial verdicts selected and suppressed aspects of local stories elicited during the course of the investigation in order to craft an account of local neighbourhood that suited a broader cultural narrative of Massachusetts Bay’s political consolidation during the 1650s.