中国三大都市圈经济增长趋于收敛还是发散?——基于协整分析和Granger因果检验

本文采用Engle和Granger(1987)提出的协整检验方法和Im、Pesaran和Shin(1997)的方法,从时间序列分析角度入手,研究目标是在不同的空间尺度上(全国和三大都市圈),从不同的时间尺度上揭示中国区域经济差异的演化规律。探索改革开放以来三大都市圈区域经济不平衡程度的演化历程与变化趋势。主要结论:长三角和珠三角具有收敛趋势而环渤海都市圈内不存在收敛;三大都市圈之间不存在收敛趋势,在长期受两个共同冲击的影响。     

金融发展、制度演进与经济增长

根据内生增长理论,确定经济增长的影响因子,然后着重考察制度因素,将其与金融发展的指标变量建立回归模型,以此深入分析金融发展作用于经济增长的制度演进渠道.研究结果表明:无论在长期还是短期内,金融发展对制度演进的影响较大;并且金融中介对制度演进的作用明显要大于金融市场.     

CEV模型的单位根检验研究

CEV模型（Constant Elasticity of Variance Model）作为常用的利率模型,在实证分析中得到了广泛运用,但是其单位根检验一直被忽略或者被默认可以使用迪基一富勒检验。本文首次运用Box—Cox变换的技巧,针对CEV模型的单位根检验问题,找到了合适的统计量并且证明其渐进分布存在,然后通过蒙特卡罗方法求出了该统计量的分布表。得到了在大样本的情形下可以沿用迪基一富勒检验,但在小样本的情形下与迪基一富勒检验有所偏差的结论。     

Efficiency,Cointegration and Contagion in Equity Markets: Evidence from China,Japan and South Korea*

This paper empirically examines whether three East Asian stock markets, namely, those of China, Japan and South Korea, are individually and/or jointly efficient, and whether contagion exists between the cointegrated markets. While individual market efficiency is examined through testing for the random walk hypothesis, joint market efficiency is examined through testing for cointegration and contagion. The present study finds that the hypothesis of individual market efficiency is strongly rejected for the Chinese stock market, but not for the Japanese and the South Korean stock markets. However, when testing for cointegration, market efficiency is strongly rejected for all these markets. We take a simple case of contagion and find that although there is a long‐term relationship among the three markets, the contagion hypothesis cannot be rejected only between Japanese and South Korean stock markets, indicating short‐run portfolio diversification benefits from these two markets.     

交易者结构与市场行情:来自深圳股票市场的经验证据

证券市场微观结构理论的核心问题是证券价格的形成与决定,众多学者从不同角度探讨证券市场价格的影响因素,其中投资者结构是影响证券价格的一大重要因素.为了探讨影响中国证券市场价格的微观因素,本文使用各种类型投资者数量作为衡量投资者结构的指标,运用协整检验和Granger因果关系检验方法研究深圳股票市场中交易者结构与市场行情间的内在关系.实证结果表明,在深圳股票市场中,市场价格与个人交易者总数之间存在长期稳定的协整关系,个人交易者总数的变化与市场价格变化间存在着显著的单向因果关系,即交易者总数的变化可以通过市场价格的变化来解释.而市场价格与机构交易者总数之间既不存在长期稳定的协整关系,也不存在单向或双向的因果引致关系.     

Evidence on the existence of speculative bubbles in farmland prices

We conduct tests for the contribution of speculative bubbles to farmland prices. These tests are carried out under the hypothesis that farmland investors rationally form expectations. The outcome of tests reported here allows us to infer whether farmland prices are determined by market fundamentals-discounted returns from the highest economic land use-or whether rumors about farmland price movements are self-fulfilling. The tests are stationarity and cointegration tests relating farmland prices to rents. The tests are carried out using data from three farm production regions-the Corn Belt, the Northern Plains, and the Lake States. In each region, we find little evidence to reject the hypothesis that market fundamentals determine farmland prices.     

PEDAKSI: Methodology for Collecting Data about Survey Non-Respondents

The effects of unit non-response on survey errors are of great concern to researchers.However, direct assessment of non-response bias in survey estimates is rarely possible.Attempts are often made to adjust for the effects of non-response by weighting, but thisusually relies on the use of frame data or external population data, which are at bestmodestly correlated with the survey variables. This paper reports the development ofa method to collect limited survey data from non-respondents to personal interviewsurveys and a large-scale field test of the method on the British Crime Survey (BCS).The method is shown to be acceptable and low cost, to provide valid data, and to haveno detrimental effect on the main survey. The use of the resultant data to estimatenon-response bias is illustrated and some substantive conclusions are drawn for the BCS.     

Random walk and efficiency tests in the Asia-Pacific foreign exchange markets: Evidence from the post-Asian currency crisis data

This paper empirically tests the random walk and efficiency hypothesis for 12 Asia-Pacific foreign exchange markets. The hypothesis is tested using individual as well as panel unit root tests and two variance-ratio tests. The study covers the high (daily) and medium (weekly) frequency post-Asian crisis spot exchange rate data from January 1998 to July 2007. The inferential outcomes do not differ substantially between the unit root tests and the variance-ratio tests when using daily data but differ significantly when using weekly data. With the daily data, both types of unit root tests identify unit root components for all the series and two variance-ratio tests provide the evidence of martingale behavior for majority of the exchange rates tested. With the weekly data, panel unit root tests identify unit root component for the exchange rates and, the unit root tests on a single series basis identify unit root component for 10 foreign exchange markets. However, the variance-ratio tests reject the martingale null for the majority of the exchange rates when using weekly data.     

浅析AutoCAD工程制图中的合理设置比例问题

在工程制图中，合理设置比例是一个关键问题。如设置不当会给你的绘图带来许多问题和麻烦。本文重点介绍图形单位、绘图比例、屏幕缩放比例、出图比例的概念、相互关系以及如何设置。