流动性和可预测股票回报：一个实证检验

一、引言(一)股票回报可预测自从证券市场诞生以来,预测证券回报一直是人们关注的焦点之一。根据Fama(1970),回报可预测性被分为基于过去回报信息的“弱形式(weak form)”可预测性和基于过去公开信息的“半强形式(semi-strong form)”可预测性。弱形式可预测研究探讨回报的序列依赖性,这种序列依赖性也可捕获期望回报的可预测变化(predictablevariation);半强形式可预测研究使用其它公开可得的滞后变量作为工具(instrument)①。研究者发现的有效预测变量包括短期利率水平、股票市场指数的红利收益、长期和短期国债利差、低等级公司债券(高…     

Panel Seasonal Unit Root Test: Further Simulation Results and An Application to Unemployment Data

Summary: In this paper the seasonal unit root test of Hylleberg et al. (1990) is generalized to cover a heterogenous panel. The procedure follows the work of Im, Pesaran and Shin (2002) and is independently proposed by Otero et al. (2004). Test statistics are given and critical values are obtained by simulation. Moreover, the properties of the tests are analyzed for different deterministic and dynamic specifications. Evidence is presented that for a small time series dimension the power is low even for increasing cross section dimension. Therefore, it seems necessary to have a higher time series dimension than cross section dimension. The test is applied to unemployment data in industrialized countries. In some cases seasonal unit roots are detected. However, the null hypotheses of panel seasonal unit roots are rejected. The null hypothesis of a unit root at the zero frequency is not rejected, thereby supporting the presence of hysteresis effects. * The research of this paper was supported by the Deutsche Forschungsgemeinschaft. The paper was presented at the workshop “Unit roots and cointegration in panel data” in Frankfurt, October 2004 and in the poster-session at the EC2 meeting in Marseille, December 2004. We are grateful to the participants of the workshops and an anonymous referee for their helpful comments.     

非均衡发展战略与中国城乡收入差距的关系——来自省级面板数据的经验分析

运用非均衡发展战略理论构建中国城乡收入差距成因的理论框架。利用2005—2008年中国省级的数据资料,建立了panel data模型,实证研究中国偏向城市的财政政策、金融政策、就业政策、贸易政策以及偏向城市的社会保障制度和公共产品供给制度对中国城乡收入差距的影响,研究表明：非均衡发展战略所衍生的一系列偏向城市的制度和政策是导致城乡收入差距的原因,逐步改革户籍制度,打破城乡二元体制,统筹城乡发展是缩小城乡收入差距的基础。     

Panel Data单位根和协整分析

一、ＰａｎｅｌＤａｔａ的含义ＰａｎｅｌＤａｔａ (或者ＬｏｎｇｉｔｕｄｉｎａｌＤａｔａ)可译成“板面数据” ,是用来描述一个总体中给定样本在一段时间的情况。通过对样本中每一个样本单位进行多重观察 ,得到的一个数据集。这种多重观察既包括对样本单位在某一时期 (时点 )上多个特性的观察 ,也包括对样本单位的这些特性在一段时间上的连续观察。在宏观经济领域 ,它被广泛应用于经济增长、产业结构、技术创新、金融、税收政策等领域 ;在微观经济领域 ,它被大量应用于就业、家庭消费、入学、市场营销等领域。从 1990年到目前为止 ,已有近…     

面板数据的模型建立和检验分析

面板数据分析是数量经济学中一门重要的分支,在经济领域中有着广泛的应用。文章详细地介绍了面板数据的主要类型及模型的建立和检验。     

Keeping Time: An Analysis of Errors in the Measurement of Unemployment Duration

This study uses longitudinal microdata from the Current Population Survey to examine the consistency with which unemployment duration is reported. An estimate of measurement error is proposed and analyzed. A significant negative relationship is found between the initial month's unemployment duration and the reported change between surveys. On average, persons who begin spells of unemployment in the second month report durations greater than the actual time elapsed. Overall, the average duration of unemployment in this sample may be overstated by at least two weeks. A brief discussion of some implications for empirical labor market research concludes the article.     

同期相关面板数据结构突变单位根检验的统计性质 ——中国CPI指数平稳性的经验证据*

 内容提要：本文首先研究了同期相关面板数据外生同期截距突变同质面板单位根检验的统计性质。研究发现对于大面板数据该检验具有良好的实际检验水平,面板数据的大小、同期相关程度、结构突变位置和结构突变幅度等因素对该检验的检验功效具有显著影响,而且ρSUR检验比τSUR检验有更理想的检验效果。其次,利用该检验对中国省级CPI指数的平稳性进行了经验分析,发现中国省级CPI指数是趋势结构突变的平稳过程。     

经济发展方式对贫困减缓效应的门槛面板回归检验

文章选取1997-2015年的相关数据,运用面板门槛回归模型研究经济发展方式与贫困减缓之间的关系.研究结果表明,经济发展方式对贫困减缓存在双重门槛效应.以经济发展水平为门槛变量,经济发展方式对贫困减缓产生积极的影响,且经济发展水平越高,经济发展方式对贫困减缓的作用越明显,呈梯度渐进增强趋势;以经济发展方式转变程度为门槛变量,经济发展方式对贫困减缓产生显著的正面效应,呈现出先下降后上升的特征.     

城市森林对经济发展影响的实证检验——基于281个城市的面板数据

文章基于2001—2017年中国281个地级及以上城市的森林资源及地区经济发展的数据,运用空间面板SARAR模型,系统考察了城市森林资源状况对中国经济发展的影响及其作用机制。结果发现,城市森林建设可以显著提升中国地区的经济发展;城市森林资源影响中国经济发展的途径可以通过人力资本集聚等途径来实现;城市森林资源的经济效益是广泛存在的,不因城市规模大小而消失或减退。对以上结论的进一步检验发现其仍然是稳健的。     

An Interview with Three Members of the Kate Sharpley Library

Abstract

Jessamyn West interviews three members of the Kate Sharpley Library, a library, reference service, and publishing association that provide access to information about anarchism and anarchist history. The library was founded in South London in 1979 and is now a distributed project, including locations in California and South London and working members in Ireland.     

联合p值综列单位根检验的扩展及其对中国股市的弱有效性检验

一、引言从现存文献可以看出,综列(panel data,或译为面版数据)单位根检验已成为近期计量经济理论与应用研究的前沿领域之一。我们知道,标准的非平稳检验是针对总量时间序列的单位根检验,而综列单位根检验则是将多个观测对象即横截面单元组合而形成面版数据的综列单位根检验,由此导致了实现这种检验方法论的特有困难:如横截面单元是否相关、同质或异质性、N和T趋于无穷大的次序等,均会影响到检验统计量的构造和渐近分布。从应用的角度看,综列非平稳性不仅是大多数经济或金融数据的基本特征,更重要的是,综列单位根检验的应用范围显著扩大。…     

积极债券投资策略实证研究

一、引言债券是固定收益产品中的主要类型,是与股票并驾齐驱的两大基础金融产品之一。债券有着明确的期限和相对确定的现金流,因此适合于厌恶风险和喜欢有稳定现金流的投资者。债券按照不同的属性可以区分出很多的种类,这些不同种类的债券可以满足不同投资者的需求,从而也成为了现代投资组合管理中重要的投资对象。可以说,债券投资已经成为证券投资一个非常重要的组成部分。在国内的债券市场上,随着最近几年的快速发展,市场投资品种越发丰富,债券存量也急速增加;同时随着基金公司的崛起和保险公司的壮大,债券市场的投资主体也日渐强大。面对…     

个体协整条件下面板单位根检验统计量性质研究

 本文通过蒙特卡洛模拟试验,研究了个体间的协整关系对面板单位根检验统计量分布、实际检验水平及检验功效的影响。结果显示：个体间协整关系个数和协整向量均对检验统计量分布产生影响;同时,如果忽视个体间存在的协整关系,继续运用个体间无协整关系条件下检验统计量的临界值进行面板单位根检验,各检验统计量实际检验水平将严重失真。     

An Estimator of Shannon Entropy of Beta-Generated Distributions and a Goodness-of-Fit Test

The aim of this article is twofold: on the one hand to introduce and study some of the statistical properties of an estimator for the Shannon entropy and on the other hand to develop a goodness-of-fit test for beta-generated distributions and the distribution of order statistics. Beta-generated distributions are a broad class of univariate distributions which has received great attention during the last 15 years, as it obeys nice properties and it extends the distribution of order statistics. The proposed estimator of Shannon entropy of beta-generated distributions is motivated by the respective Vasicek’s estimator, as the latter one is tailored to the class of the beta-generated distributions and the distribution of order statistics. The estimator of Shannon entropy is defined and its consistency is studied. It is, moreover, exploited to build a goodness-of-fit test for the beta-generated distribution and the distribution of order statistics. Simulations are performed to examine the small- and moderate-sample properties of the proposed estimator and to compare the power of the proposed test with the power of competitors under a variety of alternatives.     

The Balance Point: Keeping Serial Bibliographic Records Viable in a Digital Age

Abstract

Michael Norman, head of serials cataloging at University of Illinois at Urbana-Champaign (UIUC) library, describes his library's development of an integrated management system for serials, the Online Research Resources (ORR). The ORR was designed to draw together and deliver to the public a wide range of information related to the library's serial holdings that previously could only be obtained by consulting a number of sources. With a single search, UIUC patrons can now consult the ORR for serials information such as variant titles, online availability, subject categories, print summary statements, ISI impact factor, where the title is indexed, and whether it is peer reviewed—an innovation sorely needed and highly welcomed by librarians and patrons alike.     

The Balance Point: Keeping Serial Bibliographic Records Viable in a Digital Age

Michael Norman, head of serials cataloging at University of Illinois at Urbana-Champaign (UIUC) library, describes his library's development of an integrated management system for serials, the Online Research Resources (ORR). The ORR was designed to draw together and deliver to the public a wide range of information related to the library's serial holdings that previously could only be obtained by consulting a number of sources. With a single search, UIUC patrons can now consult the ORR for serials information such as variant titles, online availability, subject categories, print summary statements, ISI impact factor, where the title is indexed, and whether it is peer reviewed—an innovation sorely needed and highly welcomed by librarians and patrons alike.     

“堤坝”型结构突变的时间序列单位根检验及其应用——对PPP的经验分析

通过解读一些经济变量的动态行为,提出了＂堤坝＂型确定趋势的概念和＂堤坝＂型结构突变的时间序列单位根检验。在结构突变位置未知的情况下,讨论了推断结构突变点位置的方法,给出了＂堤坝＂型结构突变单位根检验的一般步骤。最后,基于人民币和日元兑换美元的汇率数据,借助该检验为购买力平价（PPP）理论提供了有力的证据。