基于高频数据的我国股市羊群效应研究

行为金融理论将投资者受自身心理因素、其他投资者的交易行为和外部环境等影响而表现出的跟风投资行为称为羊群行为，大量个体的羊群行为现象被称为羊群效应。虽然羊群效应短期内增强了股票的流动性，但易导致股价严重偏离潜在价值，诱发股价异常波动、股市崩盘，甚至股灾。文章基于2018年我国453个股指的分时高频数据，建立CCK模型，研究发现：我国股市存在短期、非对称的非理性羊群效应。基于此，提出提高股市定价效率和促进市场平稳运行的建议。     

政策变化对证券市场中小投资者行为的影响分析

由于我国证券市场受政策因素影响显著、股票的市场政策干预过于频繁,致使投资者收集信息的成本过高,导致我国投资者存在较成熟市场投资者更为严重的心理偏差.本文通过博弈模型分析了政策变化对中小投资者行为的影响:在信息完全的条件下,双方皆为理性交易者,信息政策干预不会引发羊群行为,因此不会导致股市过度波动,政策干预短期和长期内皆有效.在不完全信息条件下,博弈一方为噪音交易者,信息政策干预引发羊群行为,导致股市过度波动.     

中国股市个体投资者代表性偏差行为的实证分析

基于代表性偏差,股票收益率可能是影响投资者买卖股票行为的重要因素。本文利用某营业部交易数据对股票历史收益率对我国个体投资者买卖股票交易行为的影响进行了实证分析。实证分析发现,股票历史收益率是影响投资者交易行为的重要因素,股票价格波动幅度、股票市场行情、股票收益率的期间都对投资者的交易行为产生重要影响。     

中国股市个体投资者代表性偏差行为的实证分析

基于代表性偏差,股票收益率可能是影响投资者买卖股票行为的重要因素.本文利用某营业部交易数据对股票历史收益率对我国个体投资者买卖股票交易行为的影响进行了实证分析.实证分析发现,股票历史收益率是影响投资者交易行为的重要因素,股票价格波动幅度、股票市场行情、股票收益率的期间都对投资者的交易行为产生重要影响.     

我国股票市场投资者羊群行为分析

本文首先利用信息瀑布观点对投资者羊群行为的产生进行了理论分析,然后针对我国投资者羊群行为产生的特定根源进行了探讨,并提出了降低我国股市投资者羊群行为的对策。     

我国股票市场投资者羊群行为分析

本文首先利用信息瀑布观点对投资者羊群行为的产生进行了理论分析,然后针对我国投资者羊群行为产生的特定根源进行了探讨,并提出了降低我国股市投资者羊群行为的对策.     

我国股票型基金投资行为的实证分析

羊群行为是股票市场中投资者行为的重要方面。本文以我国公募股票型投资基金为分析对象,对2007—2008年的数据进行HM值的整体检验和收益检验,得出了我国股票型投资基金羊群行为的投资特征,并对产生羊群行为的原因进行了探讨,最后提出了改善基金投资行为的若干政策建议。     

中国证券市场羊群行为实证研究

引言 羊群行为(Herd Bchavior)是指投资者在交易过程中观察并模仿他人的交易行为,从而导致某段时期内买卖相似的股票.20世纪90年代以来,随着金融学术界将研究重点转移到非基础经济因素对股价的影响上,投资者行为、特别是羊群行为对股价的影响得到了广泛关注和研究.     

中国机构投资者与市场稳定性研究

文章从机构投资者的投资行为出发,检验中国机构投资者是否存在羊群行为和正反馈交易,并且分析检验了在剔除宏观经济影响之后,机构投资者行为对市场稳定性的影响。检验结果表明,机构投资者存在较明显的羊群行为和正反馈交易行为,且羊群行为显著加剧股票波动。最后,针对研究结论本文提出了相应的政策建议。     

投资者个体的羊群行为：分布及其程度--基于分割聚类的矩阵化方法北大核心CSSCISSCI

现有研究的一个重要缺陷是无法精确地描述交易者个体羊群行为的分布及其程度,本文依据LSV及其衍生模型的思路,提出了基于分割聚类的矩阵化改进模型,并针对我国机构投资者,使用该改进模型对我国开放式基金的羊群效应进行了检验,结果发现:机构投资者个体的羊群效应分布呈现尖峰左偏的非标准形态;机构投资者在交易大盘股时的羊群效应比较明显;市场整体的羊群效应震荡增加;机构投资者个体的羊群行为会增加其投资时的收益和风险。     

Together we invest? Individual and institutional investors' trading behaviour in Poland

This paper contributes to the debate about individual and institutional investors' trading behaviour with new evidence from the Polish stock market. While most existing studies focus on institutional investors' trading in developed markets, we test for the presence of herding during market up- and downswings on an emerging market. Our unique approach is to combine an established method relying on daily prices with institutional features of the Warsaw Stock Exchange. It enables us to separate individuals from institutions by examining two trading mechanisms with different investor structures. The empirical results suggest that individuals engage in herding during market downswings, while there is less evidence of imitating trading behaviour in bullish markets. Regardless of the state of the market, institutions' trading behaviour does not appear to exhibit herd behaviour. Further evidence suggests that herding by individuals becomes less pronounced over time.     

投资者个体的羊群行为:分布及其程度——基于分割聚类的矩阵化方法

现有研究的一个重要缺陷是无法精确地描述交易者个体羊群行为的分布及其程度,本文依据LSV及其衍生模型的思路,提出了基于分割聚类的矩阵化改进模型,并针对我国机构投资者,使用该改进模型对我国开放式基金的羊群效应进行了检验,结果发现:机构投资者个体的羊群效应分布呈现尖峰左偏的非标准形态;机构投资者在交易大盘股时的羊群效应比较明显;市场整体的羊群效应震荡增加;机构投资者个体的羊群行为会增加其投资时的收益和风险。     

The Nature of Corporate Income Tax Under a Full Imputation Tax Regime: A Test of Functional Fixation

This paper tests two competing hypotheses describing investors' behavior: the efficient market hypothesis and the functional fixation hypothesis. In particular, this study examines how Taiwan's stock market interprets the nature of corporate income tax after the 1998 Tax Reform, which switches from the classical tax system to the integrated tax system. This Tax Reform changes the nature of corporate income tax from a pure operating expense to an individual shareholder's tax credit, but current GAAP still treats it as an operating expense in the income statement. The empirical results show that Taiwan's stock market perceives the change in nature of corporate income tax and responds accordingly.     

Gender and herding

This study uses a unique dataset from a large anonymous brokerage firm to examine the herding behavior of Chinese individual investors. The empirical evidence reveals that females are more inclined to follow the behavior of ‘same-sex’ investors. Market conditions and stock characteristics affect females and males similarly in that individual investors herd more intensively in the bull market, on stocks with better liquidity and larger market capitalization. We find female investors generally yield lower returns than males when they herd intensively, and this finding is more pronounced during a bull-market period. Outcomes from individual-level herding measurements suggest that portfolio turnover drives the difference in herding between genders.     

公司治理质量、投资者信心与股票收益

投资者信心保持和提振是一国资本市场获得持续稳定发展的基础。公司治理质量会影响外部投资者的信心吗?投资者信心影响股票收益的机理是什么?本文运用中国A股公司2006-2009年数据进行研究,结果表明,投资者信心是市场层面因素和公司层面因素共同作用的结果。公司治理质量越高,外部投资者信心越强;投资者信心变化通过投资行为形成溢价对股票回报产生影响,这种正向影响在治理质量高的公司中得到增强,在治理质量高的公司中,投资者信心越强,股票回报越大。     

Individual Investors' Sentiment and Temporary Stock Price Pressure

Using data for the Hong Kong stock market, where individual investors' sentiment is likely to be influential, this study finds that the publication of individual investors' sentiment temporarily affects stock prices regardless of the publication's incompetence in predicting stock returns. Specifically, when the publication reports that more and more investors are optimistic, the return on the day just after the publication is higher and the return several days later is lower. Furthermore, the results are strongest for small stocks, and weakest for large stocks. It seems that some individual investors buy (sell) stocks when others, as reported by the publication, are optimistic (pessimistic), and that the trading causes temporary buying (selling) pressure initially and price reversals afterwards.     

Does herding behavior exist in Chinese stock markets?

This paper examines the presence of herd formation in Chinese markets using both individual firm- and sector-level data. We analyze the behavior of return dispersions during periods of unusually large upward and downward changes in the market index. We also distinguish between the Shanghai and Shenzhen stock exchanges at the sector-level. Our findings indicate that herd formation does not exist in Chinese markets. We find that equity return dispersions are significantly higher during periods of large changes in the aggregate market index. However, comparing return dispersions for upside and downside movements of the market, we observe that return dispersions during extreme downside movements of the market are much lower than those for upside movements, indicating that stock returns behave more similarly during down markets. The findings support rational asset pricing models and market efficiency. Policy implications of the results for policymakers are discussed.     

中国个人投资者处置效应研究——一个非理性信念的视角

处置效应是指投资者过早卖出盈利股票而长期持有亏损股票的现象。大量文献表明金融市场投资者存在显著的处置效应,但其产生的原因和机理存在争议。本文在前景理论框架下,构建了包含投资者非理性预期的离散时间投资组合决策模型,发现处置效应随投资者情绪升高而减弱。本文使用我国某券商2007—2009年近177万个人投资者股票账户的交易数据进行了实证分析,得到与理论模型预测的一致结果,即投资者情绪与投资者处置效应之间呈现显著的负相关关系。而且,受情绪影响,投资者处置效应在估值难度较大的股票中更弱。本文结论对理解投资者处置效应、优化投资者卖出决策和加强资本市场基础制度建设具有一定理论和实践意义。     

信息不对称、过度自信与股价变动

信息传导的非同步和投资者情绪变化是股票市场的两个典型特征,前者会引发投资者之间出现信息不对称问题,后者主要体现为投资者过度自信,两者共同作用影响股票价格变动。本文将信息不对称和投资者过度自信情绪置于同一个分析框架,建立两阶段动态序贯定价理论模型研究现实市场上信息传导过程中股价变动的内在机制。结果表明:(1)面临新信息的进入,投资者对股票收益预期的调整与均衡价格之间具有正相关关系;(2)面临有利消息时,过度自信投资者比例越大,股票的均衡价格越高,投资收益将越低;面临不利消息时则相反;(3)随着过度自信投资者比例以及过度自信程度升高,市场风险溢价将下降;(4)投资者群体在信息传导过程中出现分化,对股价变动形成异质信念,未获取信息和获取信息但未出现过度自信的投资者认为股价被高估,获取信息且出现过度自信的投资者认为价格被低估,促使更多的交易,引发市场成交量和股价变动;(5)过度自信投资者比例与过度自信程度提高均会对市场效率产生正向影响,而对市场深度具有负向效应。最后,基于理论结果对非对称性和持续性等典型的市场波动性特征进行解释。