Bias of distance functions estimates and Primont and Primont’s homotheticity test

The question of whether a technology exhibits particular properties such as radial input or output homotheticity is a crucial one for a producer since it should strongly impact on its reactions to market changes. Primont and Primont (Econ Lett 45:191–195, 1994) established that it can be tested using only weak assumptions. They further used their results to test for input homotheticity of an educational production technology (Primont and Primont, Can J Econ 29:587–591, 1996). In this paper, it is shown that if not implemented properly, the test can lead to biased results. Some ways to obtain unbiased results are also suggested.

施工升降机齿轮锥鼓形渐进式防坠安全器检验方法的研究

针对施工升降机防坠安全器的检验状况,阐述了检验项目和手段,通过搭建防坠安全器检验实验平台,将检验项目如制动性能试验、安全器制动距离、齿轮转动轻便灵活性试验等逐一在检验平台上完成,并通过采集软件获得有效检验数据,对数据进行归纳、总结分析得出检验结论,最终形成一套完整的检验防坠安全器的方法。人机工作原理的专用操作控制台将各种仪器、电脑及显示器,控制器与操作按钮等布置在同一操作台内,紧凑,实用,美观,可以满足各种安全器检测的需要,整个检测过程不需人工干预,实现检测过程自动化,为今后全面开展防坠安全器的检验业务提供了技术支持。     

我国股市投机泡沫分析——基于非线性协调整关系的实证检验

近期研究表明投机泡沫具有周期性破灭特性,但传统检验方法无法针对我国股票市场的特点识别投机泡沫的这种特性,这会对股市泡沫的存在性造成误判.因此,本文引入MTAR模型,通过检验协整残差的非对称调整假设,对我国股票市场发展的不同阶段是否存在泡沫现象进行对比分析.结果表明,长期来看我国股票价格和其内在价值之间存在着均衡关系,但短期内对均衡的调整是非对称的,即存在周期性破灭的投机泡沫,且自2001年下半年以来这种泡沫成分正在逐渐减退.在此基础上进一步揭示了我国股票市场价格波动的深层原因.     

山东省公路运输与经济增长的协整分析

本文运用协整检验、误差修正模型及Granger因果关系检验对山东省公路运输和GDP之间的关系进行了实证分析,结果表明:①公路运输与GDP之间存在长期的协整关系;②公路运输的短期波动对GDP有显著的正影响;③两者不具有因果关系。     

WAGNER'S LAW: AN ECONOMETRIC TEST FOR SOUTH AFRICA, 1960‐2006

The main objective for this paper is to test Wagner's law by analysing the causal relationships between real government expenditure and real income for South Africa for the period 1960‐2006. The paper tests the long‐run relationship between the two variables using the autoregressive distributive lag approach to cointegration suggested by Pesaran et al. We use the Granger non‐causality test procedure developed by Toda and Yamamoto, which uses a vector autoregression model to test for the causal link between the two. Evidence of cointegration is sufficient to establish a long‐run relationship between government expenditure and income. However, support for Wagner's law would require unidirectional causality from income to government expenditure. Therefore, cointegration should be seen as a necessary condition for Wagner's law, but not sufficient. This research does find a long‐run relationship between real per capita government expenditure and real per capita income. Results for the short‐run causality find bidirectional causality. On the basis of empirical results in this paper, one may tentatively conclude that Wagner's law finds no support in South Africa.     

人民币即期汇率与NDF的关联性：对NDF限制政策的实证研究

检验和揭示境内人民币即期汇率与境外NDF间的互动关系,可为各类市场主体提供有益的市场信息和参考.本文针对2006年10月出台的对境内机构和个人参与境外人民币NDF交易的限制性政策,实证研究了该政策实施后人民币即期汇率与NDF的相互影响.格兰杰因果性检验表明:即期汇率引导12个月期限的NDF;12个月期限的NDF不引导即期汇率.境内现汇市场显现出本土信息优势.在一定程度上说明人民币汇改和限制性措施的成效性,但限制性政策却可能并非长远之计.     

房地产价格指数周期的宏观分析

本文建立了中国房地产价格指数的投机度模型,区分了房地产价格增长的价值和泡沫成分,动态刻画了一个由基本面增长、泡沫推动及价格的价值回归等因素共同作用形成的完整房地产价格周期,定量地研究了现阶段我国房地产的泡沫度及其发展趋势,得出了我国房地产市场泡沫成分对货币流动性高度敏感的结论。通过稳定性测试,我们定量分析了货币政策回归稳健对房地产市场可能带来的冲击,并对地方政府、商业银行及监管部门提供了建议。     

增值税转型对财政收入影响的实证研究——以吉林省为例

本文以吉林省为例,实证分析了增值税转型对财政收入的影响。结论表明:局部转型不会给中央财政收入带来较大冲击,短期内地方财政收入存在减少的因素、但影响并不大,对个别以单一产业结构为主的市县财政收入有一定的影响。Granger因果检验表明,增值税对财政收入变化产生的影响效应需要滞后4年才能显现出来;协整分析表明,增值税与财政收入之间存在着长期稳定的均衡关系,增值税转型政策在短期内会对财政收入产生一定的影响,但这种影响效应较小。