投资者情绪、市场波动与股市泡沫

我国投资者情绪容易受到噪音交易者影响,其他类型交易者可利用噪音交易者的交易策略在博弈中获取超额利润,这为投机性泡沫的产生提供了微观基础。在市场波动机制中,投资者情绪与股价变化存在动态关系,股价泡沫存在内在持续性,引发市场正反馈效应,从而促成投机性泡沫的生成。     

投资者情绪、股票市场流动性和经济增长

采用2000—2009年的GDP、股票市场流通市值以及交易值的季度数据,从实证角度对此时段的投资者情绪、股票市场流动性和资本化率进行计量分析,通过ADF单位根检验、Johansen协整检验及Granger因果检验研究投资者情绪、股票市场流动性和股票市场发展之间的关系,进而揭示了投资者情绪影响经济增长的途径。结果显示,投资者情绪和股票市场流动性是经济增长的格兰杰原因。     

国际投资者非理性情绪下的中国国际收支稳定性研究

自2001年以来,经常项目账户和资本与金融项目账户顺差的指数型增长将我国推向了全球国际收支平衡问题的风口浪尖。在国际金融危机频发、跨境流动资金波动剧烈的背景下,我国反常顺差所具有的潜在风险非常值得关注。鉴于此,文章的研究重点在于:(1)采用涉及27个国家股票市场的数据,构建并计算了反映国际投资者情绪变化的风险偏好指数;(2)将国际市场投资者情绪等因素纳入分析框架,实证分析了影响国际资金在我国跨境流动的驱动因素,以辨别跨境资金中的不稳定成分,并给出相应的政策建议。     

When Do Opening Stock Returns Tend to be Higher?

Abstract

In this study, I make an effort to formulate a trading rule that would make use of some systematic interday patterns in individual stocks’ opening returns. I analyze intraday price data on all the stocks that were S&P 500 Index constituents during the period from 1993 to 2012. I document that if the general market direction of the previous day's opening session is controlled for, then a stock's opening return tends to be higher if, on the previous trading day, its opening return was relatively high (either positive, or higher than the same day's opening market return) and its open-to-close return was relatively low (either non-positive, or lower than or equal to the same day's open-to-close market return). Finally, for the sampling period, I construct two different investment portfolios involving a long position in the stocks on the days when, according to the findings, their opening returns are expected to be high and a short position in the stocks on the days when, according to the findings, their opening returns are expected to be low. Both portfolios are found to yield significantly positive returns, providing evidence for the practical applicability of the documented patterns in opening stock prices.     

股市投机泡沫:理论模型、检验与度量方法研究

投机泡沫是导致泡沫经济并引发经济危机的重要根源,而不断扩大的股市泡沫则预示着泡沫经济的到来。投机泡沫的度量方法包括股价指数的上涨时间、上涨速度和换手率、股票市场的相对成长性估值类方法和Q比率方法。但是这些方法对经济发展及社会的经济环境不能全面地考虑。应构造建立在股票内在价值基础上的检验方法,运用相对估计指标对泡沫进行全面的度量,从而提高泡沫检验的准确度和对股票价值检验及预测的实际应用能力。     

Does investor sentiment dynamically impact stock returns from different investor horizons? Evidence from the US stock market using a multi-scale method

This article uses the investor sentiment index to investigate the Granger causality between investor sentiment and stock returns for the US economy using a multi-scale method. To focus on the local analysis of different investor horizons, bivariate empirical mode decomposition is used to decompose time series of investor sentiment and stock returns at different timescales. We employ the linear and nonlinear integrated Granger causality method to examine the causal relationship of decomposed series on similar timescales. The results indicate both strong bilateral linear and nonlinear causality between longer-term investor sentiment and stock returns. However, there is no strong evidence for correlation of stock returns and investor sentiment on shorter timescales.     

股票市场收益跳跃性风险研究

中国股市是一个“政策市”,政策因素是造成我国股票市场收益（价格）跳跃性行为的最重要的原因。首先,本文深入而系统地阐述了股票收益（价格）发生跳跃性行为的经济机制,并将跳跃风险从总体风险中分离出来;然后描述了跳跃性风险的测度方法、跳跃性风险的定价及其对于风险管理的影响,以便能够为投资者和政府决策者提供一些有益的理论支撑,     

全球市场一体化——全球情景下Fama-French三因子模型检验

通过在全球情景下检验Fama-French三因子模型,分析了新兴市场与发达国家的市场一体化水平。沿用Griffin的研究方法,利用涵盖35个国家、时间跨度超过30年的股票市场数据,分析并比较了基于世界、国际和本国三种视角构建的Fama-French三因子模型在解释股票收益差异上的适用性。结果如下:不同国家或地区在市值因子(SMB)、账面市值比因子(HML)和市场资产组合(MRF)上的相关性不足以说明市场一体化水平;三种模型对发达国家和发展中国家的股票市场都具有解释力;与Griffin的研究结果一致,Fama-French本国版模型最能有效解释股票收益率差异,因此没有必要将模型放在全球情景框架下加以考虑。     

Information in stock prices: the case of the 2016 U.S. presidential election

On the day before the 2016 U.S. presidential election, the odds of Hillary Clinton winning the presidency, according to political prediction markets, were above 90%. Surprisingly, Donald Trump won the Electoral College handily. In this study, we examine how movements in specific stock prices foreshadowed the eventual outcome. Specifically, we conduct a series of standard event-study tests focused on pharmaceutical companies, which became a focal point during the presidential campaign. Results show that while stocks of pharmaceutical companies significantly underperformed the market prior to the election, prices substantially increased beginning three days before the election outcome. This increase is both statistically significant and economically meaningful and robust to various event-study methodologies. These results suggest that some sectors of the stock market seemed to anticipate the election outcome.     

金融资产泡沫实证研究

研究表明,我国股市存在泡沫,绝对泡沫度最大时达77%。但至2001年底,我国股市泡沫已经获得有效压缩,接近市场理论基础。     

中国股票市场Beta和收益关系的实证分析

本利用Pettengill(1995）的剩余市场收益模型以及Fama的两阶段回归方法,考察了中国股市1997年1月-2001年5月上海证券交易所的21支股票的周收益率。当市场收益在于无风险收益时,Beta和收益显正相关,当市场收益低于无风险收益时,Beta和收益显相关。可见,Beta在解释股票间的差异方面是一个有用的工具。     

基于泡沫理论的中国股市风险研究

基于泡沫理论,完善了原有的泡沫系数模型,用实际股市指数的变化率与理论股市指数的变化率之比作为新的泡沫系数,实现了对我国股市风险的更精准测度。