国际股票市场收益率和波动率的长记忆性研究

股票市场长记忆性问题是金融学研究的一个热点问题,对于市场有效性的研究和系统非线性结构的分析有着重要的意义。本文运用修正R/S分析和V/S分析两种方法对世界上28个国家(地区)的股票指数的日、周收益序列和日、周收益波动序列进行了完整的长记忆性研究。结果表明:对于收益序列,以美国为代表的大多数发达国家股市一般不存在长记忆性,而中国等发展中国家大多存在显著的长记忆性,尤其中国股市的长记忆性最强;对于收益波动序列,所有国家(地区)都具有长记忆性,并强于收益序列。     

What Drives European Football Clubs’ Stock Returns and Volatility?

The article studies the main determinants of European football clubs’ stock returns and volatility. A panel-data analysis of a sample of 24 European football clubs was conducted to test the influence of several variables, based on a matrix of internal/external and real/financial dimensions, on both stock returns and their volatility. The results show that clubs’ stock returns are influenced by the real and financial context and by a set of internal variables such as profit considered as a reflection of accounting discipline, capitalization as an indicator of size and stadium attendance as a proxy indicator of reputation. The volatility of stock returns seems particularly vulnerable to the overall instability on stock markets and dependent on clubs’ profit and net players’ transfers and, to a lesser extent, on sporting outcomes.     

股市收益和波动性长期记忆的国际比较——基于V/S的经验证据

现有研究运用经典和修正R/S分析探讨我国股票市场的长期记忆效应。本文运用更为稳健的V/S分析,对比研究上证股市和另外7个国家和地区的股票市场,分别诊断各股市日收益和周收益、及三种典型度量的收益波动的长期记忆效应。研究表明:股市日收益和周收益序列都不存在显著的长期记忆;三种典型度量的收益波动普遍存在显著的长期记忆;日收益波动比周收益波动的长期记忆更显著。     

The Return‐Implied Volatility Relation for Commodity ETFs

We examine the return‐implied volatility relation by employing “commodity” option VIXs for the euro, gold, and oil. This relation is substantially weaker than for stock indexes. We propose several potential reasons for these unusually weak results. Also, gold possesses an unusual positive contemporaneous return coefficient, which is consistent with a demand volatility skew rather than the typical investment skew. Moreover, the euro and gold are not asymmetric. We relate the results to trading strategies, algorithmic trading, and behavioral theories. An important conclusion of the study is that important differences exist regarding implied volatility for certain types of assets that have not yet been explained in the literature; namely, the results in this study concerning commodity ETFs versus stock indexes, plus previous research on stock indexes versus individual stocks, and the pricing of stock index options versus individual stock options. © 2013 Wiley Periodicals, Inc. Jrl Fut Mark 34:261–281, 2014     

我国推出股指期货对股票市场波动性影响的实证研究

本文以2006年11月1日至2010年12月27日的沪深300指数收盘价为原始数据,建立GARCH及EGARCH模型,进行实证研究,探究我国推出股指期货对股票市场波动性的影响。通过对该模型的分析,得出结论:股指期货在我国的推出,一定程度上降低了我国股票现货市场的波动性,对我国股票现货市场的健康发展起到了维稳作用。     

中国股票市场行为与投资者情绪

The relationship among stock returns, market volatilities and individual investor sentiment is an important topic in behavioral economics and finance. This paper uses a unique data set—China’s newly opened stock trading accounts to test the relationships among stock returns, volatilities and individual investor sentiment in the Chinese stock market. It is found that there is a positive relationship between shifts in sentiment and stock returns, and that shifts in sentiment are negatively correlated with market volatility, that is to say, volatility increases (decreases) when investors become more bearish (bullish).      

Liquidity shocks,commodity financialization,and market comovements

We explore whether and how liquidity factors influence risk transfers between commodity and stock markets using a composite liquidity index and five different types of liquidity measures. We find that liquidity shocks, including both funding liquidity and market liquidity, are positively associated with comovements between commodity and stock markets after 2000, although the relationship is insignificant before 2000. The structural change indicates that financialization creates a role for adverse liquidity shocks to increase cross-market correlations. Further evidence shows that the effect of liquidity on cross-market correlations is state-dependent and intensifies when liquidity conditions deteriorate and asset returns sustain substantial declines. Our findings are not explained by business cycles.     

基于高频数据的波动率与成交量动态关系研究

传统的价量分析都是从低频数据来分析股票市场上波动率、收益率与成交量之间的关系。基于高频数据,利用分位数回归并结合高频数据的波动率估计方法对高频数据中所呈现出的价量关系进行研究,并分析了股票价格跳跃过程所带来的跳跃方差与成交量之间的关系。实证分析表明：指数及个股收益率与成交量之间的关系并不显著;波动率、跳跃与成交量之间存在着显著相关的关系,个股的波动率与成交量之间的关系显著并呈现出正向相关关系,而指数的波动率与成交量之间呈现出一种负向关系,并且关系比较微弱;个股的成交量的改变会导致股票价格的跳跃方差的减小,而指数的成交量的改变则使得指数的跳跃方差增大。     

证券交易税对市场波动性的影响:来自中国股市的证据

本文运用ARCH族模型检验了2001年股票交易印花税税率降低对沪、深股市波动性的影响,为有关证券交易税对市场波动性影响的讨论增添了一个来自新兴市场的证据。计量结果表明,该次税率变动对沪市波动性的影响在统计上是不显著的;深市的波动性在税率降低后虽然有统计上显著的增加,但是这个变化太小,没有实际意义。我们的研究结果表明,对于像中国股市这类市场结构和市场制度处于变化之中的新兴市场,如果试图通过调整证券交易税税率这类显性的交易成本来影响市场波动性,其效果是有限的。     

我国股票市场收益、交易量、波动性动态关系的实证分析

本文对我国股票市场上证指数和深圳成指的收益、交易量、波动性之间的动态关系进行了实证研究,研究结果表明:收益和绝对收益与交易量之间均存在正相关关系;收益与交易量以及绝对收益与交易量之间存在双向Granger因果关系(线性或非线性);深圳成指收益的波动方差对收益具有正向作用,而上证指数收益的波动方差对收益没有直接的影响;上证指数和深圳成指的成交量对股指收益的波动方差不具有解释作用.     

The limits to stock index arbitrage: Examining S&P 500 futures and SPDRS

This study examines factors affecting stock index spot versus futures pricing and arbitrage opportunities by using the S&P 500 cash index and the S&P 500 Standard and Poor's Depository Receipt (SPDR) Exchange‐Traded Fund (ETF) as “underlying cash assets.” Potential limits to arbitrage when using the cash index are the staleness of the underlying cash index, trading costs, liquidity (volume) issues of the underlying assets, the existence of sufficient time to execute profitable arbitrage transactions, short sale restrictions, and the extent to which volatility affects mispricing. Alternatively, using the SPDR ETF as the underlying asset mitigates staleness and trading cost problems as well as the effects of volatility associated with the staleness of the cash index. Minute‐by‐minute prices are compared over different volatility levels to determine how these factors affect the limits of S&P 500 futures arbitrage. Employing the SPDR as the cash asset examines whether a liquid tradable single asset with low trading costs can be used for pricing and arbitrage purposes. The analysis examines how long mispricing lasts, the impact of volatility on mispricing, and whether sufficient volume exists to implement arbitrage. The minute‐by‐minute liquidity of the futures market is examined using a new transaction volume futures database. The results show that mispricings exist regardless of the choice of the underlying cash asset, with more negative mispricings for the SPDR relative to the S&P 500 cash index. Furthermore, mispricings are more frequent in high‐ and mid‐volatility months than in low‐volatility months and are associated with higher volume during high‐volatility months. © 2008 Wiley Periodicals, Inc. Jrl Fut Mark 28:1182–1205, 2008     

Robustness of the Black and Scholes Formula

Consider an option on a stock whose volatility is unknown and stochastic. An agent assumes this volatility to be a specific function of time and the stock price, knowing that this assumption may result in a misspecification of the volatility. However, if the misspecified volatility dominates the true volatility, then the misspecified price of the option dominates its true price. Moreover, the option hedging strategy computed under the assumption of the misspecified volatility provides an almost sure one-sided hedge for the option under the true volatility. Analogous results hold if the true volatility dominates the misspecified volatility. These comparisons can fail, however, if the misspecified volatility is not assumed to be a function of time and the stock price. The positive results, which apply to both European and American options, are used to obtain a bound and hedge for Asian options.     

The impact of the US stock market opening on price discovery of government bond futures

We examine price discovery in sequential markets for the 10-year US Treasury note, German bund, and UK gilt futures over the period 2010–2017. We find that price discovery increases after the opening of the US stock market. Order flows in the bond futures markets are more informative for permanent price changes in the 30-min period after the US stock market opens. A placebo test using US statutory holidays confirms our findings. A cross-market analysis suggests that the increased price discovery in the bond futures is related to returns and net order flows of the US stock market.     

中国股市扩大买卖盘揭示范围的效应分析——对市场波动性影响的实证研究

2003年 12月沪深股市扩大买卖盘揭示范围,大幅提高了市场的交易前透明度。本文分别用统计假设检验和计量经济学模型,实证分析了该政策实行前后的市场波动性是否有明显变化。结果表明,买卖盘揭示范围的这次调整,对中国股市的波动性没有明显影响;来自中国证券市场交易前透明性改革的实证结果,并不支持透明性在一定程度上影响市场质量的理论观点。     

Investor Sentiment and Stock Market Volatility: Evidence from India

In this article, the authors probe the role of irrational investor sentiment in the determination of Indian stock market volatility. The authors developed a new irrational aggregate sentiment index (IASI) to examine the issue. The conditional volatility is extracted from the nonlinear univariate models for the market indices and the IASI. The vector autoregression (VAR) is carried out to analyze the relationship between the volatility of irrational aggregate sentiment index and stock market volatility. The authors find a unidirectional causality from sentiment to stock market volatility, and their findings highlight the significance of sentiment in explaining the stock market volatility in India.     

Volatility Spillovers and the Risk-Return Relation Between Stock and Foreign Exchange Markets in Brazil

We examine the evidence of mean and volatility spillovers between stock and foreign exchange markets in Brazil with multivariate GARCH models and nonlinear Granger causality tests. We also use a multivariate GARCH-in-mean model to assess the relationship between risk and return in these markets. The results indicate that the stock market leads the foreign exchange market in price formation and that nonlinear Granger causalities from the exchange market to the stock market do occur. Part of these nonlinear causalities are explained by volatility spillovers. We show that exchange rate volatility affects not only stock market volatility but also stock returns.     

货币流动性和市场流动性:波动与风险

目前,货币流动性和市场流动性的关系成为股票市场参与者关注的焦点。本文分析了货币流动性与市场流动性的联系,实证研究了货币流动性和市场流动性的波动关系,以及货币流动性对市场流动性风险的影响,发现货币流动性M2、M1和市场非流动性动态负相关,M0与市场非流动性动态不相关;货币流动性M2和M1的正向冲击能一定程度降低市场流动性波动风险,而M0会增加市场流动性波动风险,市场流动性风险自身是影响市场后期流动性风险的最大因素。     

经济政策不确定性对我国股市波动的影响——基于2007—2019年上证指数的实证分析

股票市场的波动受到宏观经济政策的影响。本文研究2007年1月—2019年10月的月度数据,其结论如下:(1)主效应的经济政策不确定性越高,我国股市波动率越低;(2)在惯性因素上我国股市波动率会显著受到滞后波动率的影响;(3)在结构性断点上我国股市波动率在2008年金融危机和2010年融资融券交易处存在结构性断点;(4)在交互效应上2010年融资融券交易制度的建立降低了股市波动率对于经济政策不确定性的敏感程度。本文的研究结论拓展了研究边界,为宏观政策制定及资本市场投资提供了思路参考。     

我国股市非对称反应影响因素的实证分析

本文运用T-Garch-M模型对我国股票市场的特征风格指数和不同样本期的综合指数进行了实证分析,结果表明,市道(牛市或熊市)、市盈率高低、盈利状况(绩优或绩差)、股价高低和股票风格特征(价值股或成长股)等因素对我国股票市场信息非对称反应有显著影响,股票规模大小(盘子大小和市值大小)对非对称性反应的影响不显著。     

Return and volatility spillovers among CIVETS stock markets

Coined in 2009, the CIVETS refers to Colombia, Indonesia, Vietnam, Egypt, Turkey, and South Africa as a new group of frontier emerging markets with young and growing populations and dynamic economies. We provide a first look into the return and volatility spillovers between the CIVETS countries by employing causality-in-mean and causality-in-variance tests. The empirical results indicate that the contemporaneous spillover effects are generally low. Nevertheless, CIVETS stock markets may exhibit higher degrees of co-movements at times. The structure of the causal relationships further suggests the presence of intra-regional and inter-regional return and volatility interdependence effects.