噪音交易与股价过度波动:理论与中国经验分析

中国股市股票价格的波动性过大,引起这种现象的一个重要原因是噪音交易的存在和频繁发生。本文采用事件分析法,随机抽取了上海A股市场的近200种股票作为样本,通过构建正反馈交易的"涨幅组合",对噪音交易者投资的累积异常收益率进行检验。结果表明:股市过度波动与噪音交易频繁有密切的联系;噪音交易者通常要承受巨大的风险,但其投资收益率一般情况下却为负。     

基于GARCH模型的中国股市研究

文章主要研究了2005年沪深证券交易所联合发布沪深300指数以来,中国股市的波动性。通过分析沪深300指数2005年4月11日至2011年5月18日1484个日交易数据,利用SAS9.1软件建立了GARCH统计模型,研究了中国股市的收益率波动性。     

信息不对称下的投资者类型与交易行为——来自上海股市的经验证据

本文利用上海股市投资者每笔的委托和成交数据,分析信息不对称环境下机构、大户和散户的交易行为特点。从研究结论来看,大户是上海股市中最为知情的投资者,其交易行为不但会影响随后的股价涨跌,也会影响到散户的交易决策;散户则扮演了噪音交易者的角色,其频繁进行的大量交易为大户和机构无偿提供了流动性;机构并不采用趋势交易策略,但在交易决策上具有一定程度的羊群行为。     

我国证券市场正反馈交易的实证检验及其原因和对策分析

所谓的正反馈交易是一种追涨杀跌的交易策略。众多研究发现,这种交易策略会使证券市场表现出超常的波动性,而且这种交易策略是众多股市泡沫产生的根源。文章对我国证券市场的正反馈交易进行了实证研究。结果显示我国证券市场存在显著的正反馈交易现象,这种现象降低了市场的稳定性,表明我国的证券市场存在着大量的噪音交易者。     

中国股市规模效应及成因研究

基于横截面回归分析方法对中国股市1997年至2004年所有A股月收益率进行的逐月回归分析,结果发现在1997-2000年间存在显著的"规模效应",但此后基本消失;通过分析不同规模组合以及同一规模组合在规模效应消失前后月换手率的变化,证实了过度投机是规模效应产生的主要原因,而小市值股票的超额收益是对因过度投机产生的噪音交易风险的补偿.     

中国股市：超级赌场？

在中国内地股市新股交易是典型的投机交易。在中国股市中，几乎没有人愿意买入并长期持有股票——这是不成熟市场的显著特征。这是一个大问题，因为中国越来越需要一个能够有效地把资金分配给高速成长的工业基地的股市。     

融资融券对于股票市场波动性的影响——基于中国A股市场分析

文章结合中国A股市场现状,分析融资融券交易对股市波动性的影响作用,在当前阶段,融资融券业务总体规模较小,对股市的影响作用也相对较弱,但是影响作用正在逐步加大;并且在股市波动中,融资交易属于是Granger原因,对股市波动性的影响作用是显著的,也是一个复杂变化的过程;而融券交易不是股市波动性的Gr anger原因,对股市的波动性的影响作用也不显著,但融券交易在股市波动中属于是单向影响作用。     

噪音交易者长期生存与效应研究

噪音交易者作为金融市场中的非理性投资者,传统的观点认为他们是不能长期存在于市场中的,然而噪音交易理论的最新研究成果证明了噪音交易者不仅可以获得正的预期收益,而且还具有长期生存的能力。噪音交易者的长期存在必然会对股票市场带来负面影响,这些影响主要表现在噪音交易者对套利者的驱逐、证券市场功能弱化以及股价过度波动等方面,因此,深化股票市场改革,削弱噪音交易者的影响对于稳定股市有积极而重大的意义。     

中国股市“政策效应”新特征——来自QFII的实证分析

中国股市历来对政策具有强烈的敏感性。本以“QFII出台会引起股市短期内强烈波动”为假设，通过构建QFII指数时间序列、进行相关性分析、运用干预分析模型和ARCH族模型检验，并没有发现预期的市场反应。在此基础上，作从横向和纵向细分了股市各期“利好”政策，提出“中国股市‘政策效应’逐步减弱”和“‘政策效应’激发务件发生改变”的结论，并据此拟订政策建议。     

中国股市的指数套利策略

虽然股指期货迟迟没有推出，但是金融工具的多样化是金融市场发展的必然趋势，在中国资本市场推出股指期货也只是一个时间的问题。因此，本文对推出股指期货后机构投资者如何利用这一金融工具进行指数套利展开研究。本文将从中国股市无做空机制这一特有现象入手，提出在中国股市进行指数套利的策略。     

股指期货限制交易对定价效率影响研究*——基于跨市场信息传递视角的实证

从跨国金融市场信息传递的视角对中国2015年股灾中股指期货限制交易政策实施前后的中美市场实证分析表明：股指期货的限制交易政策极大地增强了美国市场对中国市场的影响，尤其是在下跌行情中的影响更大。分位数回归显示美国市场的交易活动对中国市场开盘价的影响呈“V”型特征，美国市场的微小波动都会引起中国市场的巨大波动，限制交易措施实施后，在下跌行情中来自美国市场的负冲击对中国市场的影响变得更大。这一实证研究的政策含义在于：为了增强股指期货市场的定价效率，金融监管层在市场稳定后应放开股指期货的限制交易，并通过降低准入门槛和合约大小等措施提高市场的开放程度。此外，监管层和国内投资者不能忽视美国股指期货对国内市场的影响。     

The dynamic impact of bilateral trade linkages on stock market correlations of Australia and China

This article aims to examine the long-run equilibrium relationship between bilateral trade linkages and stock market correlations of Australia and China using quarterly data from 1993 to 2015. Further, this study explores the impact of trade intensity on stock market correlations using OLS, Dynamic OLS (DOLS) and Fully Modified OLS (FMOLS) models. The empirical results confirm that there is a significant long-run relationship among the variables. In addition, our results, based on OLS, DOLS and FMOLS, show that increasing trade intensity between Australia and China has a significant and positive impact on their stock market correlations. The Global Financial Crisis also contributed for their stock market interdependence. Our results therefore suggest that the bilateral trade relations between Australia and China have brought their stock markets together over time. The findings of this study offer significant policy and practical implications. The policymakers need to be aware of the economic changes in those countries as they will immediately reflect on their stock market performance and relationship. Similarly, the global investors need to be aware of the fact that the diversification opportunities between Australia and China have considerably declined over time as their markets became more interdependent in the recent past.     

Trade openness and the informational efficiency of emerging stock markets

This paper examines the empirical link between trade openness and the informational efficiency of stock markets in 23 developing countries. Our fixed effects panel regression results document a significant negative relation between trade openness and stock return autocorrelations only when the de facto measure is used. On this basis, we argue that a greater level of de facto trade openness is associated with a higher degree of informational efficiency in these emerging stock markets because the former signals higher future firm profitability, and investors tend to react faster to information when there is less uncertainty about a firm's future earnings or cash flows. Further analyses find no significant association between the extent of financial openness and the degree of informational efficiency.     

社保基金投资组合的 定价效率和投资风险研究 基于股价同步性的实证检验

笔者利用2007年到2013年各个季度我国沪深两市A股交易数据,以股票价格收益率与沪深300指数收益率的同步性衡量股票的定价效率,通过实证模型分析社保基金投资对股票定价效率的影响。研究表明,当市场处于金融危机前后的牛市和熊市时,社保基金投资对股票定价效率无显著影响,当市场处于较平稳的阶段时,社保基金能显著提高股票的定价效率并降低了投资风险。这说明社保基金参与资本市场投资能提高我国资本市场的有效性。     

我国股票市场指数与国际股票市场主要指数的联动性研究——基于协整分析

本文对2002—2009年中国股票市场与国际主要股票市场的每日收盘数据进行统计分析,运用相关性检验、协整检验和格兰杰因果关系检验实证了上证综合指数、深圳成分指数分别与香港恒生指数、道.琼斯指数、日经225指数、法国CAC40指数和伦敦金融时报指数之间存在相关、协整关系。进一步研究我国股票市场与国际股票市场的联动性,结果表明,国际股票市场对我国股票市场的影响越来越明显。这表明中国股票市场日趋成熟,逐渐与相对完善的国际股票市场接轨。     

The source of global stock market risk: A viewpoint of economic policy uncertainty

This study explores the effect of economic policy uncertainty (EPU) in four countries or regions (China, Japan, Europe, and the United States) on the contagion risk of investments in the global stock market. The stock returns of 22 stock markets worldwide are analyzed to determine which region’s EPU exhibits the greatest effect on regional systematic risk in the global stock market and on volatility risk in individual stock markets. First, all of the samples, the markets of different continents and the spillover indices of the developed and emerging markets, are calculated to observe the dynamic correlation among these markets with the aim of quantifying regional systematic risk and further examining the contagion risk effect of EPU. The results indicate the following: EPU in China is the most influential, and its contagion risk spreads to different regional markets, except for Europe; the effect of EPU in the United States is inferior to that in China; EPU in Japan merely influences contagion risk in emerging markets; contagion risk in European markets is not influenced by the four EPU indices; and EPU in Europe is not influenced by contagion risk in the global stock market. However, according to the volatility risk in each market, the EPU in Europe and China respectively influence Asian countries and European countries the most. These results may be attributable to the extremely high trade dependence among these countries because the performance of international enterprises is mainly determined by the economic policies of their trading partners.     

Exploring the nexus between financial openness and informational efficiency – does the quality of institution matter?

This article examines the empirical link between financial openness and informational efficiency of stock markets in 27 emerging markets. Improving on earlier papers, this study has used World Bank’s Worldwide Governance Indicators (WGI) as the proxy of institutional development in dynamic panel data models estimated by generalized method of moments (GMM). Our results show, first, financial liberalization by itself has no impact on enhancing efficiency of stock market. Second, for countries with high level of institutional development, the interaction of trade openness and financial openness become significant. Third, for the same group of countries, interaction effect of financial liberalization and institutional development leads to more efficiency in stock market. Hence, our finding demonstrates the utmost importance of institutional development and its role on liberalization. Our results conclude that institutional development and trade openness are pre-requisites for a country to benefit from financial openness. Our study further provides empirical evidence to theoretical model proposed by Basu and Morey (2005) that governance is the missing link between stock market efficiency and financial liberalization. Our findings suggest that policy makers in developing economies should enhance the quality of their institution in order to optimize the benefits of financial liberalization.     

中国股票市场透明度改革效果的理论与检验

文章通过观察我国股票市场微观结构特征,在理性预期的分析框架内,用贝叶斯模型解释交易成本、信息不对称和价格发现效率,给出交易前透明度增加对市场微观结构产生影响的三个假设。在此基础上,选择沪深300指数样本股票,采用三种不同检验方法对假设进行实证检验。检验结果表明:交易前透明度的增加,减少了交易成本,降低了股票交易中的信息不对称,提高了市场的价格发现效率。     

“金砖四国”股票市场间相依结构分析

金融市场间的相依关系及其结构分析是金融风险测度、资产组合管理等金融理论和实务中的一个重要问题,而基于线性相关系数是难以正确刻画非线性条件下金融资产间的相关结构,特别是尾相依关系。为研究"金砖四国"新兴股票市场间的相依结构,文章构建了一个混合Copula模型,对"金砖四国"股票市场间的相依结构进行建模分析,并将结果与单一阿基米德Copula模型进行了比较,表明混合Copula模型既能保留单一Copula模型的特性,更能灵活、全面地刻画变量间的相依关系。实证研究的结果表明:在样本数据期间,"金砖四国"股票市场间存在非对称相关关系,相依结构上存在差异;中国上证综指波动较为剧烈,与其它三国指数间以下尾相依为主;巴西、印度、俄罗斯三国股指间的相依结构相似,联动相关性相近,并无显著的下尾相依关系。