金融市场风险、金融市场无效性与多重分形——基于沪深300股指期货和恒生股指期货的比较分析

本文首次将多重分形、市场无效性和市场风险放在一起进行研究,并基于此提出了多重分形测度模型,为此对沪深300股指期货和恒生股指期货进行了实证对比分析.本文主要在以下四方面有所贡献:一是发现多重分形概括总结了市场无效性和市场风险,市场无效性和市场风险是多重分形产生的原因;二是提出了通过度量多重分形强度来度量市场无效性和市场风险的多重分形测度模型;三是基于MF-DFA方法实证分析了沪深300股指期货多重分形特性,并实证比较分析了沪深300股指期货和恒生股指期货多重分形的异同及其原因;四是构建了比Hurst指数更有效的指标即市场无效性指数.     

基于多重分形方法的我国期货市场特征研究

本文运用多重分形消除趋势波动分析方法,对之前较少被研究的中国铜和小麦两个期货品种的价格收益序列进行实证研究。结果表明,两种期货价格收益序列不服从正态分布且具有尖峰态特征,因此二者均存在明显的多重分形特征,单一的标度指数无法对其充分的描述。对其多重分形成因进行分析后发现,收益序列的波动相关性导致其多重分形特征,并引起价格的有偏随机游走,市场未达到弱式有效。     

中国股指期货市场长记忆性及对股票现货市场有效性影响实证分析

基于股指期货日收盘价数据,我们建立了能够同时测度其收益率和波动率的双长记忆性的ARFIMA-FIGARCH模型,模型估计结果表明我国股指期货的日收益率序列及其波动率序列均出现较显著的长记忆性特性,即我国股指期货市场是非有效市场.进而对股指期货上市前后沪深300指数的双长记忆性行为的进一步研究,发现股指期货的推出有助于促进我国股票现货市场的有效性.     

浅析无风险利率对股指期货合约价格波动抑制

在发达的股票现货市场,对股票价格的预期可以引起股指期货合约价格的变化。但是通过对股指期货持仓成本模型的分析,我们发现无风险利率在理论上对股指期货合约的价格也会施以影响。从对由持仓成本模型结合无风险套利原理推导出的股指期货合约价格模型分析,指出无风险利率与股指期货合约价格的关系,借助于对无风险利率的控制从而减弱因股票现货市场价格波动而使期货市场股指期货合约价格的波动效应。     

股指期货市场操纵与价格发现功能的关系研究

股指期货市场操纵会影响股指期货市场的价格发现功能,同样地,股指期货市场的价格发现功能也会影响股指期货市场的操纵行为。本文在理论探讨的基础上,利用股指期货主力合约及对应的沪深300指数高频数据对市场操纵行为进行实证分析。研究结果表明,当操纵嫌疑只存在于期货市场时,股指期货市场的价格发现功能将会减弱;当操纵嫌疑存在于期货、现货两个市场时,股指期货市场的价格发现功能相对会增强。而且,当股指期货市场价格发现功能较强时,市场操纵的难度和成本都将下降。当前中国股指期货市场的操纵行为可能主要局限于某些个别的、离散的交易日内,系统地通过操纵现货指数来操纵期货市场的可能性较低。     

沪深300股指期货市场与现货市场联动性及引导关系实证分析

该文借助计量经济学平稳检验、葛兰杰因果检验、协整检验及自回归向量误差纠正模型(VECM),对中国沪深300股指期货市场与现货市场时间序列数据作实证分析.研究结果表明,沪深300股指期现货市场波动相互影响,互为葛兰杰因果关系;沪深300股指期货和现货之间呈长期稳定的协整关系;无论从长期还是短期来看,股指期货市场对股票现货市场的作用均较大;沪深300股指期货是现货下跌的引领者而非推动者.     

基于MF-DFA的我国外汇市场的多重分形特征分析

本文用MF-DFA的方法研究了人民币外汇市场的多重分形特征和有效性,发现人民币外汇市场呈现出多重分形特征,外汇市场尚未达到弱有效状态。运用打乱原始序列和蒙特卡罗模拟生成替代序列的方法,研究了导致多重分形的主要原因,发现我国人民币外汇市场呈现多重分形的主要原因是长程相关性和肥尾分布,这为人行有效管理外汇市场提供了一条思考的方向。     

我国股指期货市场价格发现功能和波动溢出效应研究——基于VECM-DCC-MVGARCH模型

本文对我国股指期货市场的价格发现功能进行了实证研究。首先用Granger因果检验分析了两个市场的因果关系。其次分析了股指期货市场和现货市场之间的领先-滞后关系、波动率传导和条件相关关系。最后通过脉冲响应函数分析了两个市场对信息反应的速度。实证结果表明期货和现货市场互为Granger因果关系,但期货价格发现功能要强于现货市场,期货市场对信息反应速度比现货市场要快,并且从期货市场到现货市场存在显著的波动溢出。     

沪深300股指现货和期货市场相互影响的发展趋势

从2006年的模拟股指期货交易到2009年9月中金所推出沪深300股指期货,股指期货对现货市场的影响如何？从量、波动率和分布方面来说,股指期货推出后,现货市场产生了显著变化.在现货市场和期货市场的价格发现功能方面,很多研究人员对不同时问段的样本数据进行了实证研究,本文综合其它学者的研究成果和2011年的数据的实证检验,从实证的结果发现期货市场的价格发现功能在增强.A+H等特有股本结构对结果影响不大.本文研究了年际间期货市场和现货市场相互影响的发展趋势,旨在提供一些研究参考.     

交易量和波动率动态因果关系研究——基于沪深300股指期货高频数据的实证分析

利用我国沪深300股指期货的高频数据对沪深300股指期货合约交易量和波动率的动态因果关系进行研究.经验证据表明,我国沪深300股指期货市场具有显著的“杠杆效应”,同时股指期货合约的非预期交易量是信息量的有效代理变量,可以很好地解释波动率,二者没有显著的Granger因果关系,因此我国股指期货市场支持了分布混合假说(MDH).其政策含义在于,我国股指期货市场是有一定“市场效率”的,同时该结论对于市场的投资者和套利者都有一定的现实意义.     

Analysis of efficiency for Shenzhen stock market based on multifractal detrended fluctuation analysis

We divided the whole series of Shenzhen stock market into two sub-series at the criterion of the date of a reform and their scale behaviors are investigated using multifractal detrended fluctuation analysis (MF-DFA). Employing the method of rolling window, we find that Shenzhen stock market was becoming more and more efficient by analyzing the change of Hurst exponent and a new efficient measure, which is equal to multifractality degree sometimes. We also study the change of Hurst exponent and multifractality degree of volatility series. The results show that the volatility series still have significantly long-range dependence and multifractality indicating that some conventional models such as GARCH and EGARCH cannot be used to forecast the volatilities of Shenzhen stock market. At last, the abnormal phenomenon of multifractality degrees for return series is discussed. The results have very important implications for analyzing the influence of policies, especially under the environment of financial crisis.     

中国股指期货“助涨助跌效应”实证研究

利用E-G两部法协整检验、向量误差修正模型、VAR模型、Granger因果性检验及脉冲响应和方差分解全面剖析了股指期货与现货市场之间的联动性。实证研究结果表明股指期货和股票指数之间存在长期的均衡关系,股票指数短期的过度偏离会导致长期非均衡误差的弱势修正,当市场受到确定性信息冲击时,股票期货市场对股票现货市场具有助涨助跌作用;当市场受到不确定信息冲击时,股票现货市场对股票期货市场具有助涨助跌作用。     

限制交易政策如何影响期现关系?——对股指期货价格发现功能的实证检验

本文利用2015年中国股市大幅下跌期间,对股指期货严格限制交易政策这一独特事件前后的高频数据,研究限制交易政策对股指期货与股票市场价格引导关系的影响。利用I-S模型和分位数回归方法的实证结果表明:限制交易政策实施前,股指期货对股票市场的价格影响更强,尤其表现在价格急剧下跌时期;限制交易政策显著增加了期货市场交易成本,从而降低了期货市场的信息份额,削弱了其对股票市场的价格影响,并且改变了期货价格对现货价格“助跌强于助涨”的影响模式,增强了股指期货在价格上涨时对股票市场的影响。研究结果一方面直接量化了期货交易成本变动对其价格发现功能的负面影响,另一方面也从价格引导关系的视角提供了股市危机时期股指期货限制交易政策监管效果的实证证据。     

Asymmetric multifractal features of the price–volume correlation in China’s gold futures market based on MF-ADCCA

In recent years, fractal theory has become a recognized research direction for explaining various complex phenomena that are difficult to constrain in the conventional efficient market hypothesis for financial markets. Moreover, because the gold futures prices are crucial to the futures market, research on the relationship between quantity and price is important for understanding market fluctuations. Therefore, this paper conducts an empirical analysis of the multifractal features and asymmetry in the price–volume correlation of China’s gold futures market based on the multifractal asymmetric detrended cross-correlation analysis method¹ . Results show that the cross-correlation between market price and volume is asymmetric and multifractal and that multifractal features are stronger when the price increases compared with when it declines. Moreover, the multifractal features vary over time. These findings indicate that the risk of China’s gold futures market will change with the price trend over time.     

The International Transmission of Arbitrage Information Across Futures Markets

Abstract:   This paper examines whether deviations from a domestic spot‐futures relation, as identified through mispricing series in stock index futures, spillover international boundaries. Such spillovers suggest that information from a mispricing series in one market conveys a signal of similar mispricing in another market. In the presence of arbitrage traders and in the absence of market frictions, mispricing series should be independent across international boundaries. The study employs a VAR analysis of stock index futures mispricing across three large futures markets – Australia, the UK and the USA. Using time zone differences, tests are conducted for the daily transmission of arbitrage information. The results reveal the relationship between mispricing series is bi‐directional. Based on this finding, a trading strategy is employed to examine the economic significance of apparent profits. The results show that some profits are possible after transaction costs but that a long horizon, probably beyond the scope of most traders, is required to exploit the spillover information.     

沪深300股指期货与现货市场间风险传染效应及影响因素

本文选取2005—2019年我国沪深300股指期货和沪深300股票指数日收盘价数据,结合股票推出时间、股价波动性,设置样本组、对照组,运用GARCH模型、DCC-GARCH模型、Granger因果关系检验及多元线性回归模型分析了沪深300股指期货与现货间的风险传染效应及影响因素,并结合研究结论提出对策,以期促进资本市场健康发展。结果表明:沪深300股指期货市场与现货市场间存在双向的风险传染效应,且经DCC-GARCH模型分析表明风险传染效应在动荡期尤为明显;影响这种风险传染效应的因素有很多,主要表现为微观因素中的股票市场流动性和股票市场不确定性与极端事件两个方面。     

股指期货合约存续期价格引导关系的时变性研究

针对股指期货非季月合约存续期较短这一特点,按一定的标准将股指期货非季月合约2个月的存续期划分为合约上市期、主力合约期、非主力合约期、合约交割期等阶段,采用单位根检验、协整检验、格兰杰因果检验、脉冲响应分析等方法,利用各阶段5分钟或1分钟高频交易数据对股指现货、股指期货主力合约、股指期货非主力合约的价格引导关系进行实证分析,得出的结论是股指期货非季月合约在其存续期内的价格引导能力具有明显的时变性特征,股指期货和现货市场的跨市场监管者和交易者需要根据股指期货合约价格引导关系的时变性来合理制定自身的监管策略和交易策略。     

An alternative approach to evaluating the agreement between financial markets

This research investigates that the price relationship between a stock index and its associated nearby futures markets can be explained by the cost-of-carry model using the concordance correlation (CC) coefficient in the US financial markets. The main purpose of this research is to confirm that the CC coefficient is an appropriate methodology to determine ex post arbitrage opportunities and to maximize ex ante arbitrage profits through the analysis of the price relationship derived from the cost-of-carry model. To increase the robustness of the results and to enable us to generalize our conclusions, this analysis is carried out in consideration of external uncertainty, including the marking-to-market procedure of futures contracts and the transaction cost on the stock index and its futures markets, under several assumptions related to the conditions of transactions. Examining transaction price data on the S&P 500 stock index and its futures markets shows that the CC coefficient gives a good result for ex ante arbitrage profits and is appropriate for analyzing the relationship between the observed stock index futures market price and its theoretical price derived from the cost-of-carry model.     

A Likelihood Ratio Test of Price Volatilities: Comparing Stock Index Spot and Futures

This paper uses three methods to estimate the price volatility of two stock market indexes and their corresponding futures contracts. The classic variance measure of volatility is supplemented with two newer measures, derived from the Garman-Klass and Ball-Torous estimators. A likelihood ratio test is used to compare the classic variance measure of price volatilities of two stock market indexes and their corresponding futures contracts during the bull market of the 1980s. The stock market volatilities of the Standard & Poor's 500 (S&P 500) and New York Stock Exchange (NYSE) indexes were found to be significantly lower than their respective futures price volatilities. Since information may flow faster in the futures markets than in the corresponding stock market, our results support Ross's information-volatility hypothesis. It was also noted that the NYSE spot volatility was lower than the S&P 500 spot volatility. If the rate of information flow and firm size are positively related, then the lower NYSE spot volatility is explained by the size effect. The futures price volatilities for the two indexes were insignificantly different from each other. With stock index spot-futures price correlations approaching unity, one implication of our results for index futures activity is that smaller positions in futures contracts may suffice to achieve hedging or arbitrage goals.     

我国股指期货与股票交易的关联性分析

股指期货上市交易后对股票现货市场波动性的影响取决于届时股票现货市场的估值水平,其交易过程和结果也将改变市场投资主体结构及参与程度,形成交易主体多元化的格局。同时,我国股票现货市场对股指期货的交易也存在着反约束.