证券市场流动性的测度方法研究

证券市场流动性综合指标是由价格波动、成交量、成交时间等三个方面综合构造而成。价格波动、成交量和成交时间是此消彼涨的三个因素,组合构成了等流动性曲面,该曲面的函数形式就是市场综合流动性的数学形式。基于单波方程进行理论推导,并且使用上交所的成交数据实证分析,发现负指数函数形式符合等流动性曲面的特征。使用负指数模型指标统计分析上海市场日内和周内的综合流动性分布,发现日内流动性分布呈现梯形,10:30～14:30之间的流动性最高;周内流动性分布也呈现梯形,周三和周四的流动性最好,而周一和周五的流动性较差。     

我国燃料油期货与现货市场价格发现和波动溢出效应研究

借助VECM、带误差修正项的双变量TGARCH模型以及DCC模型,对我国燃料油期货和现货市场间的价格发现和波动溢出效应进行了研究。结果表明：我国燃料油期货和现货价格之间存在长期均衡和双向引导关系,期货在价格发现中起主导作用;期货市场不存在显著的杠杆效应,现货市场存在明显的负向非对称效应;两个市场间仅存在单向的波动溢出,表现为现货市场向期货市场正向溢出;误差修正项对两个市场的波动具有很好的解释能力,可以更加准确地刻画两个市场的波动性;DCC模型表明信息在两个市场间是流动的,两市的整合程度较高,但两市的相关系数还不是很高。     

东亚危机中金融传染的研究——基于香港、日本和新加坡股票市场的实证

本文选取香港、日本和新加坡股票市场指数,建立GARCH(1,1)模型刻画其波动性;然后采用相关分析、Granger因果检验和脉冲响应分析,分别对三个市场的收益率序列和波动率序列是否发生传染进行研究。研究结果表明,东亚危机中存在日本和新加坡股票市场之间收益率和波动率的溢出效应,即存在金融传染,传播路径为新加坡到日本;而日本、新加坡与香港市场间不存在传染机制,只存在依存关系。     

基于GARCH模型的集装箱运价指数及其衍生品波动性研究

建立GARCH族模型对上海集装箱运价指数(SCFI)欧洲航线和美西航线指数、SCFI衍生品(欧洲航线和美西航线)价格的波动特征进行分析。ARCH效应检验发现只有美西航线衍生品价格去均值收益率序列存在条件异方差性,其他三个序列不存在ARCH效应。对美西航线衍生品价格去均值收益率序列建立GARCH模型,发现基于残差服从GED分布假设下的GARCH(1,1)最优,存在较强的波动持续性;美西航线衍生品收益率与风险无关。建立非对称GARCH模型分析美西航线衍生品价格去均值收益率的杠杆效应,TARCH和EGARCH模型均显示序列不存在杠杆效应。     

股指期货市场的价格发现与风险波动溢出效应实证研究——以中国沪深300股指期货市场为例

本文以中国沪深300股票指数现货市场与期货市场的真实交易日数据为研究对象,借助构建的EC-EGARCH模型,通过本文设定的5个假设检验,对两个市场之间价格发现功能与波动溢出效应特征进行了深入研究。发现中国沪深300股票指数期货市场上市以来,其短期价格发现以及长期价格预测功能均较为显著,但短期价格发现功能呈现对称性。两个市场之间的"波动集聚"效应也非常显著。通过将股票指数期货市场与现货市场之间的风险波动溢出效应区分为短期效应和长期效应,在实证分析中发现两种效应表现出不同的特征:短期波动溢出效应表现出非对称性,而长期波动溢出效应表现出对称性。     

我国沪市周内效应实证探究——基于修正EGARCH模型

股票市场中的各种效应理论都在不断发展,引人注目。本文针对周内效应做了相关研究。结合实际,以往周内效应论文模型存在收益序列的自相关性,本文对EGARCH模型进行修正,消除了其自相关性,并利用修正的AR-EGARCH模型对上证综指1997-2010年数据进行实证检验。研究发现上海股市存在收益与波动的周内效应:收益存在负的周四效应,波动存在正的周一效应和负的周二效应,另外发现上海股市存在杠杆效应。     

浅议人民币升值对我国证券市场的影响

外汇市场和证券市场是国际金融市场的两个重要组成部分,国外学者研究显示,证券市场价格及汇率变动之间存在着单向或双向的因果关系,两个变量之间的反馈机制明显。最近持续的人民币升值对证券市场主要有三方面的影响:首先是对上市公司的业绩影响,人民币升值将改变中国目前的出口情况,从而影响依赖出口的上市公司的基本面和绩效,特别是在以美元计价的商品中有着更加突出的作用,二是影响股市资金的供给和需求,升值可能会导致投机性资本的流入或流出,第三,汇率波动和证券变动通过利率市场价格相互影响。     

利率与股价之间的价格溢出效应与波动溢出效应

基于具有外生变量的二元VAR-MGARCH模型对中国货币市场利率和股价之间的关联进行了理论分析和实证研究。结果表明,利率和股价之间基本不存在价格溢出效应;货币市场利率和股价序列均表现出时变方差的特征和波动的持久性特征,货币市场和股市之间存在双向波动溢出效应;货币供给的正向冲击对利率的影响是正向的。     

我国创业板市场和主板市场之间风险溢出效应的实证分析

本文利用GARCH-Diagonal BEKK模型、Chi-plot图以及Granger因果检验等方法,对我国创业板市场与主板市场之间的风险溢出效应(均值溢出效应和波动溢出效应)进行了实证分析,以此来分析创业板市场与主板市场之间的波动性、相关性及波动影响程度.研究结果表明:我国证券市场明显存在从主板市场到创业板市场的均值溢出效应;创业板市场与主板市场之间也存在波动溢出效应,两个市场的波动相关性随着创业板的发展而逐步提升;创业板市场与主板市场之间的风险传导强度呈现倒“V”特征(即先增加后减少).为进一步降低创业板市场的波动风险、促进创业板市场健康发展,本文提出强化创业板市场导向、健全创业板规则体系、强化投资者风险意识等政策建议.     

中国沪深股市收益率相关性的实证分析

开放的资本市场,不同市场在资金流动、市场运作等方面联系的加强使得市场间的关联度增加。我国的上海和深圳交易所同处中国大陆,所面对的经济、政治和法律环境相同,监管环境、投资者结构、上市公司的质量、治理结构相同或相似。研究这两个股市间的相关性与互动性可以反映资金流向和市场效率。上证综合指数日收益率和深证成分指数日收益率均存在较大的波动,沪深两市日收益率序列均不服从正态分布,尖峰厚尾性显著,波动存在簇族性。可用GARCH模型和EGARCH模型来拟合收益率序列的波动性,通过模型得出沪市的有效性比较强,深市对沪市收益率的溢出效应不显著。     

China,Japan and the US Stock Markets and the Global Financial Crisis

In this paper, while focusing on the impact that the global financial crisis had on the stock markets of China, Japan, and the United States, the stock-price volatilities and linkage between these three countries are analyzed. In addition, the relationships between macroeconomic variables (real-economy variables and monetary-policy variables) and stock price volatility in each country are investigated. The estimation results of the EGARCH model revealed that although China’s stock price volatility was far greater than those of Japanese and US stock prices, China was less affected by the global financial crisis in 2007 than Japan and the United States. For China, stock price volatility was greater in the early 1990s, shortly after the stock market had been established, than in 2007 when the global financial crisis occurred. Furthermore, it has been revealed that the linkage of Chinese, Japanese, and US stock prices has increased since the global financial crisis. Moreover, Granger causality testing revealed China’s real-economy variables and monetary-policy variables do not affect China’s stock price volatility.     

国内外黄金市场价格间的联动关系稳定吗?——基于外部冲击视角的分析

在全球金融市场不断开放和融合的大背景下,黄金市场不但与外部市场频繁互动,其系统内部的联动关系也变得极为多元和复杂,黄金市场间的价格联动反映了信息和风险在不同市场间的传递过程。黄金价格通常会受到外部因素干扰而产生波动,但市场间的联动关系是否会因此而改变是值得重点关注的问题,黄金市场功能的有效性及稳固的市场关系是投资者利用全球黄金市场进行对冲和避险的先决条件,同时也关系到整个金融市场的稳定性。本文将研究重点聚焦于黄金市场内部,在研究中外各主要黄金市场间动态相关性和波动溢出效应的同时引入外部冲击以检验不同因素对黄金期货、现货市场间联动关系的影响从而探讨国内外黄金市场间价格联动的稳定性问题。结果表明:中国与全球主要黄金期货、现货市场间整体上保持了正相关关系,同时与各主要黄金市场间均存在显著的波动溢出效应。在一般市场条件下,外部冲击并没有显著改变中国与全球主要黄金期货、现货市场间的联动关系,表明黄金市场内部的价格联动具有较强的稳定性。     

全球股票市场系统性风险传递网络研究

本文采用系统性风险度量新指标LASSO-ΔCoVaR,构建全样本时期及各极端时期全球股票市场系统性风险传递网络,考察全球股票市场系统性风险传递水平及结构特征,并着重对极端状态下的风险传递进行分析。研究发现:第一,无论风险输入水平还是风险输出水平,不同股市的动态变化趋势大体一致,但波动幅度迥然不同,且单个股市风险输出水平的波动幅度远大于风险输入水平;第二,成熟经济体经济基本面恶化往往会增强其股市的系统性风险贡献,而新兴经济体则不同;第三,法国、荷兰、中国香港、德国和英国股市的风险溢出水平较高,同其他股市间的风险传递途径较多,是系统性风险传递网络中的核心节点;第四,我国股市与全球股市间的风险关联较弱,但我国股市潜在风险来源面广,同区域股市及金砖国家股市在我国股市与全球股市间的风险传递发挥重要作用。     

亚洲地区股票指数收益率的波动性研究一基于GARCH族模型

为防范股票市场上的不确定性和风险,有效地度量股票指数收益率的波动性显得尤为重要。本文运用GARCH族模型,拟合了股票指数收益率的波动性方程,并实证研究了亚洲地区四个最具代表性国家：日本、中国、印度和韩国的股票指数收益率的波动性。结果表明：亚洲地区股票指数收益率的波动呈现出聚集性和持续性,股票市场存在着冲击的非对称性;中国和印度的股票市场抗风险能力比日本和韩国弱,股票指数收益率的波动性带来的负面影响更大。     

石油价格与股票市场的溢出效应——基于中美数据的比较分析

本文以中美股票市场和国际原油市场的数据为样本,用VAR模型和二元GARCH模型研究了中美股市价格和国际石油价格的收益率及波动的溢出效应。研究结果表明,中国股市价格和国际石油价格之间,既不存在任何方向的收益率溢出效应,也不存在任何方向的波动溢出效应;而国际石油价格的变化率对于美国股市收益率确有负向先导作用,并且两者之间具有双向的波动溢出。     

国际商品市场与股票市场的溢出效应——基于中美数据的VAR-MGARCH分析

基于VAR-MGARCH-BEKK模型,对国际商品市场与中美股票市场之间的均值与波动溢出效应进行了经验分析。结果表明,国际商品市场与中美股票市场之间存在着相互的均值溢出效应,国际商品市场对中美股票市场存在波动溢出效应,同时,美国股票市场对国际商品市场存在波动溢出效应;另外,中国应该尽快编制科学合理并适合自身国情的商品指数。     

Long memory and level shifts in REITs returns and volatility

This paper provides an empirical investigation of the long memory in the returns and volatility of REITs markets of the USA, the UK, Hong Kong, Australia, and Japan. Initially, we subject the series to unit root tests proposed by Saikkonen and Lütkepohl (2002) and Lanne et al. (2002), which allow for a level shift in the data generating process. We confirm the stationarity of the REITs returns in the presence of structural breaks, with the breaks happening during the 2008 and 2009 periods. Second, by employing long memory tests and estimators, a weak long memory is demonstrated in the return series, but a strong evidence is provided in the volatility measures. Then using Smith (2005)'s modified GPH estimator, we find that a short-memory model with a level shift is a viable alternative to a long memory model for the USA, Hong Kong and Japan and not for the UK nor for Australia. Finally, we confirm that the long memory in volatility is real and not caused by shifts in variance for all markets. Our results should be useful to market participants in the REITs markets, whose success depends on the ability to forecast and model REITs price movements.     

Samuelson Hypothesis & Indian Commodity Derivatives Market

Samuelson (1965) devised that futures price volatility increases as the futures contract approaches its expiration. The relation amid the volatility and time to maturity has significant inference for hedging strategies. Interestingly, so far the empirical evidence in favor of the Samuelson Hypothesis (maturity effect) is mixed in various markets. Considering no significant work to examine the relationship is so far carried out in commodity derivative markets of India, this paper ordeal the Samuelson Hypothesis on 8 commodities traded on Multi-Commodity Exchange (MCX), India. We have examined the issue by applying different regression techniques to test the hypothesis for 8 commodities (Aluminium, Nickel, Copper, Gold, Silver, Natural Gas, Crude Oil and Wheat) using inter-day data on MCX India. In order to test the Samuelson’s hypothesis, tests have been conducted using a series of GARCH, EGARCH and TGARCH models by including trading volume, open interest and time-to-maturity in the conditional variance equation. From our results, it is concluded that Samuelson’s hypothesis does not hold true for majority of commodity contracts considered. Our results also find that volatility series depend on the trading volume, compared to the time-to-maturity or open interest. As Samuelson hypothesis does not hold true for majority of commodity contracts, traders in Indian commodity derivative markets should not bias their decisions solely based on the time-to-maturity, but should also consider trading volume and open interest as they are an important determinant of price volatility. They should also consider the possibility of leverage effect while predicting future price volatilities, and the associated margin requirements.     

The determination and international transmission of stock market volatility

This paper extends the literature on low-frequency analysis of the causes and transmission of stock market volatility. It uses end-monthly data on stock market returns, interest rates, exchange rates, inflation, and industrial production for five countries (Britain, France, Germany, Japan, and the US) from July 1973 to December 1994. Efficient portfolios of world, European, and Japanese/US equity are first constructed, the existence of multivariate cointegrating relationships between them is demonstrated, and the transmission of conditional volatility between them is described. The transmission of conditional volatility from world equity markets and national business cycle variables to national stock markets is then modeled. Among the main findings are: first, world equity market volatility is caused mostly by volatility in Japanese/US markets and transmitted to European markets, and second, changes in the volatility of inflation are associated with changes of the opposite sign in stock market volatility in all markets where a significant effect is found to exist. To the extent that the volatility of inflation is positively related to its level, this implies that low inflation tends to be associated with high stock market volatility.     

Dynamic relationship between exchange rate and stock price: Evidence from China

The paper empirically analyzes the dynamic relationship between Renminbi (RMB) real effective exchange rate and stock price with VAR and multivariate generalized autoregressive conditional heteroskedasticity (GARCH) models using monthly data from January 1991 to June 2009. The results show that there is not a stable long-term equilibrium relationship between RMB real effective exchange rate and stock price. There are also not mean spillovers between the foreign exchange and stock markets. Furthermore, the paper examines the cross-volatility effects between foreign exchange and stock markets using likelihood ratio statistic. There exist the bidirection volatility spillovers effects between the two markets, indicating the past innovations in stock market have the great effect on future volatility in foreign exchange market, and vice versa.