我国股票市场与国民经济运行关系的实证研究

本文从分析上证指数及与股票市场密切相关的国民经济运行变量的时间序列入手,依据现代动态计量学的理论与方法,对我国股市和国民经济运行之间的关系进行了具体的分析,从而建立了一个向量自回归(VAR)模型,并在此基础上得出我国股市与经济运行之间的长期均衡关系和短期变动的向量误差修正(VEC)模型。实证研究的结果表明,目前股市背离国民经济运行只是暂时的现象,在一段较长的时期内,我国的股市发展依然受到国民经济运行状况的制约。     

资产组合风险度量与选择之文献述评

根据资产组合理论的本质，理解和掌握资产组合理论具有重要的意义。本文主要从风险度量方法比较、现实金融资产收益的实际分布与相关性、以及金融资产收益的动态变化特征等角度：对资产组合风险度量与选择的相关文献进行回顾与评述。     

商品原油交接中计量纠纷的技术对策

本文从近年发生的原油计量纠纷的产生原因入手,分析它们产生计量示值量差的技术成因,探讨通过现场实验和标定方法量化出差量、公正地处理争议的途径.为实现科学的、公平的和准确的交易,营造一个良好的商品原油交接的市场氛围.     

An Adjustment Procedure for Predicting Betas When Thin Trading is Present: Canadian Evidence

We have incorporated effects of the process that generates true betas for TSE stocks, as well as thin trading effects, into the beta adjustment model. We note the Blume and Dimson and Marsh beta adjustment techniques aim at eliminating beta forecast error through regression tendency bias. Effects of other sources of forecast error have been ignored. We show the process generating security betas affects both cross-sectional correlation coefficient and order bias, while thin trading affects only cross-sectional correlation coefficient. We demonstrate that when OLS beta estimates are used to forecast their future risk levels, order bias accounts for 86% of forecast error, while thin trading effects account for 14% of forecast error. A beta regression tendency model which properly accounts for effects of cross-sectional correlation (which is a function of thin trading) and order bias completely abates forecast error. Our results have implications for the use of correlation coefficient to measure stability of betas across time, for beta adjustment models proposed in the literature, and for event study methodologies that rely on prediction errors.     

天然气输销过程中的输差计算及其控制

结合燃气输销企业生产现场的实际情况，分析了输差产生的原因，给出了正确的统计方法并提出了合理的控制措施。     

Technical Inefficiency and Production Risk in Rice Farming: Evidence from Central Luzon Philippines*

There have been many previous studies of technical inefficiency in rice production in the Philippines, but none has focused simultaneously on production risk and technical inefficiency at the farm level. Rice production is inherently risky because of the heterogeneous production environment. In this study, we analyze technical inefficiency in a rainfed lowland rice environment in Central Luzon using a stochastic frontier production function with a heteroskedastic error structure. An 8‐year panel dataset collected from 46 rainfed rice farmers was used to estimate flexible functional specifications. Over the whole period, the average technical efficiency was found to be 79 percent. Results indicate that there is a high degree of variability in technical efficiency estimates, which can be attributed to the instability of farming conditions in the rainfed lowland environment. Mean output was signifificantly influenced by area planted to rice, labor and the amount of fertilizer used. Consequently, these inputs were found to be risk‐increasing, whereas herbicide was found to be a risk‐reducing input.     

The Form. Measurement and Management of Inflation Anticipation

通货膨胀是影响各国经济发展和社会稳定的重要问题,而通胀预期又是影响实际通货膨胀的重要因素。我国通货膨胀随着社会转型开始呈现周期性变化,对我国通货膨胀基于成本推动型、需求拉动型、结构型等等的研究也已经较多,但不容忽视的是,我国通货膨胀的惯性特征很强,通货膨胀的滞后效应十分明显,究其原因是通胀预期的作用。本文基于对通胀预期形成的认识,对其影响因素进行研究,然后通过实证分析,得到通胀预期形成的相关结论,最后对通货膨胀的管理提出政策建议。     

基于GLM的未决赔款准备金评估的随机性链梯法

为度量未决赔款准备金评估结果的波动性,需要研究随机性评估方法。基于GLM的随机性方法,得到准备金估计及预测均方误差。特别地,在过度分散泊松模型中,分别应用参数Bootstrap方法和非参数Bootstrap方法,得到两种方法下未决赔款准备金的预测分布,进而由该分布得到各个分位数以及其它分布度量,并通过精算实务中的数值实例应用R软件加以实证分析。实证结果表明,两种Bootstrap方法得到的参数误差、过程标准差、预测均方误差都与解析表示估计的结果很接近。     

盈余重述的市场反应及其影响因素研究——基于我国2004-2010年数据的经验分析

本文以2004-2010年盈余重述为样本,检验了我国盈余重述的市场反应及其影响因素。根据重述披露的时点选择特征,首次提出聚合重述和分离重述概念。研究发现,年报的利好消息或非利好消息对盈余重述负面影响的"抵减效应"或"加剧效应"都十分显著;剔除年报影响的分离重述的市场反应显著为-3%。研究还发现,相对于被动重述,主动重述被认为是"主动说真话"的表现,具有"坦白从宽"的效果;重述追溯调整的幅度、公司盈利能力、财务风险和债务水平,都会显著影响重述公告时的市场反应程度。     

基于向量误差修正模型的城市产业集聚效应分析——以天津市为例

本文利用向量误差修正模型研究城市产业集聚效应。以天津市为例对城市产业集聚形成的增长极、竞争优势、空间聚集与扩散、要素转移和结构调整效应进行了实证检验,结果显示天津市产业集聚形成的五种效应存在且正在发挥作用,一定程度上提高了资源配置效率,扩大了规模经济的竞争优势,并加速了要素转移和结构调整步伐。