中国股票市场贝塔系数稳定性研究

贝塔系数是用于衡量证券市场系统风险的一个重要概念,通过对贝塔系数的估计,投资者可以预测证券未来的市场风险。但是,贝塔系数要用过去的数据来估计,所以,除非贝塔系数具有相对的稳定性。否则,就无法作为证券市场未来系统风险性的无偏差估计。利用CHOW检验方法对2004年1月至12月间在深圳交易所上市的25只股票的交易数据和深证综合指数做实证分析表明,在我国证券市场上单只股票贝塔系数具有稳定性,与大部分学者观点不同;同时,又对在上海证券交易所上市的金融行业7只股票和传播与文化产业6只股票的日数据与上证综指做回归,并计算F值,说明金融行业比传播与文化产业的贝塔系数的稳定性差。     

我国保险业股票β系数稳定性分析

文章将2015年6月12日至2019年9月6日共计1036个交易日的沪深300指数日收益率作为市场平均收益率,利用Eviews 9.0计量分析软件,分别采用单一指数模型与邹氏稳定性检验方法对我国保险业的6家上市公司的β系数及其稳定性进行估计与分析,发现我国保险业股票β系数的稳定性存在差异化现象,小规模保险公司股票的β系数相较于大规模的保险公司来说更加稳定。     

β系数影响因素的实证研究综述

β系数作为资本市场上测度系统风险的重要指标,它的计算和影响因素是市场投资者进行投资决策的重要依据,正确地认识β系数以及影响因素对于在当前经济环境下的资本市场投资尤为重要。     

关于中国民生银行β系数的实证研究

β系数是一个由夏普提出的风险衡量指标。本文通过运用CAPM模型和OLS回归计算民生银行β系数并对其作异方差、自相关和单位根检验,最终得出民生银行收益率对整体股票大盘波动的敏感性。     

沪市有色金属行业股票β系数的实证研究

近几年来,有色金属价格连续上涨,刺激了国内外众多资本投资有色行业,形成了前所未有的投资热潮。但随着国家宏观调控趋紧和美国次贷危机的爆发,有色金属价格也随之波动。为度量我国上证有色金属板块的系统性风险,文章以上证有色金属板块股票为研究对象,运用CAPM模型计算各个股票的β系数和可决系数R2;尤其对经历股改的股票同时计算股改前后的β系数,并利用CHOW检验方法对β系数的稳定性进行检验,进而分析出股改的效果。     

基于β系数的我国电力行业系统性风险的研究

β系数是CAPM模型中用于说明某种证券或者证券组合的风险对市场平均风险的贡献度的系统风险度量指标。本文从我国电力行业2011年新一轮的改革入手,以电力行业深沪51家上市公司为样本,计算电力行业的β系数,并对结果进行分析总结,最后对投资者提出建议。     

改革中国股市

主题:加强政府监管对中国股市的影响. 意义:为恢复投资者对股市的信心,最近政府采取措施,严惩公司违规行为,并按国际审计规范对所有上市公司进行审查.     

全球流通股票的贝塔系数稳定性研究

贝塔系数是反映单个证券或证券组合相对于证券市场系统风险变动程度的一个重要指标。通过对贝塔系数的计算,投资者可以得出单个证券或证券组合未来将面临的市场风险状况。通常贝塔系数是用历史数据来计算的,而历史数据计算出来的贝塔系数是否具有一定的稳定性,将直接影响贝塔系数的应用效果。笔者利用CHOW检验方法对我国证券市场已经实现股份全流通的上市公司进行检验后发现,大部分上市公司在实现股份全流通后,其贝塔系数并没有发生显著的改变,用贝塔系数进行系统风险的预测可靠性还是相当高的。     

中信证券β系数的测算

证券市场价格波动性对于投资者风险与收益的分析、监管者的有效监管、上市公司股东收益最大化目标的实现,都有着至关重要的作用。文章以中信证券为例,通过计算中信证券的β系数,研究判断该证券的市场风险程度。     

重新认识中国股市

我们似乎得随着改革开放的进程,不断地一次又一次地重新认识中国股市,重新评价中国股市,对股市最基本的问题一个又一个地重新审读.因为它严重地制约着中国股市的发展.     

股指期货对股票市场的影响分析

中国股票市场发展至今已有近18年的历史,多年来,由于缺乏有效的风险对冲工具,市场一直处于一条腿走路的尴尬局面.而股指期货的推出必将对股票市场产生重大影响,本文将就此做简要的分析.     

Index options open interest and stock market returns

This study finds that the growth of index options open interest has a significant relation with future stock market returns. We propose a theoretical model that considers hedgers and informed traders in the options market and suggests that hedgers fully utilize options according to their expectations of future stock returns. The empirical results show that the growth of out-of-the-money call options open interest is significantly related with future stock market returns. These findings provide supporting evidence for our theoretical model.     

A secure,real-time stock market protocol

Stock markets constitute the largest electronic commerce market in the world. The tremendous growth in trading volume and the need for fast and accurate transaction execution has made the stock market one of the most technology friendly markets. The fastest growing stock exchange, NASDAQ, is a wholly electronic stock exchange with all transactions conducted over computer networks. However, the transaction model used by NASDAQ and other electronic stock markets still borrows heavily from the older traditional models used by non-electronic stock exchanges. Two important requirements of modern day stock market transactions are: (a) customer's ability to place sophisticated transaction orders to buy/sell stock, and (b) customer's ability to detect transaction delays. Modern electronic stock exchanges lack both the ability to place newer, more sophisticated transaction orders and the ability to detect delays in transaction execution. In this paper, we propose a protocol for stock market transaction that can model a new sophisticated model for transaction orders while continuing to support traditional transaction orders. The protocol is augmented with a mechanism to detect delays in transaction execution. It is further shown that the protocol proposed is secure, atomic, anonymous, private, and incurs low overhead costs. This revised version was published online in June 2006 with corrections to the Cover Date.     

Modelling spillovers between stock market and FX market: evidence for Nigeria

Abstract

The need to capture the foreign exchange (FX) and stock markets nexus in Nigeria is underscored by the rapidly expanding financial markets integration due to trade and financial liberalization policies which seem to have enhanced the inflow of capital as well as accelerated investment/business interactions. Using variants of the VARMA-AMGARCH model of McAleer, Hoti, and Chan (2009), we find that volatility persistence in the stock market is accentuated by bad news in the market and moderated by good news in the FX market. Finally, we establish that ignoring the asymmetric effects may exaggerate the spillover results.     

国际化进程中的中国股票市场研究

国际化既是中国股票市场发展的必然选择,又深刻影响着股市制度和结构。文章在回顾中国股票市场国际化进程的基础上,探讨了股市国际化的本质要求、基本条件和影响。研究表明,中国股票市场发展的逐步成熟与坚持国际化方向紧密相关。但要实现国际化的最终目标,还有诸多制约条件需要克服,国际化的步伐应当在逐步解决现实问题中稳步推进。     

Abnormal trading volume and autoregressive behavior in weekly stock returns in the Saudi stock market

This paper examines the relationship between the abnormal change in trading volume of both individual stocks and portfolios and short-term price autoregressive behavior in the Saudi stock market (SSM). Our objective is to investigate the informational role that trading volume plays in predicting the direction of short-term returns. We evaluate whether the abnormal change in lagged, contemporaneous, and lead turnovers affects serial correlation in returns. Specifically, we examine if and when the change in volume produces momentum (positive correlation) or reversal (negative autocorrelation) in consecutive weekly stock returns.We find a reversal in weekly stock returns when conditioned on the change in lagged volume in the SSM. Our results are consistent for the whole sample, the two sub-sample periods, and the large- and small-firm portfolios. The results are consistent with Campbell, Grossman, and Wang [Campbell, J. Y., S. J. Grossman, and J. Wang, 1993, Trading volume and serial correlation in stock returns, Quarterly Journal of Economics, 108, 905–939], who present a model in which risk-averse market makers accommodate the selling pressure of liquidity or non-informational traders. We also find that reversal is more pronounced with the loser portfolio as specified by filter-based methodology. The overall result of this paper is also consistent with the empirical findings of Conrad, Hameed, and Niden [Conrad, J., A. Hameed, and C. Niden, 1994, Volume and autocovariances in short-horizon individual security returns, Journal of Finance 49, 1305–1329.] and Gebka [Gebka, B., 2005, Dynamic volume-return relationship: evidence from an emerging market, Applied Financial Economics, 15, 1019–1029] in which they report price reversal for stock with high trading volume.     

Income and social communication: The demographics of stock market participation

This paper analyses the determinants of stock market participation decisions using officially compiled aggregate stock account opening data in China. Different from the literature that often focuses on one particular dimension, our paper systematically evaluates the relative importance of disposable income, demographic variables, macroeconomic factors, stock market conditions and social communication on both the level and the change of the participation rate. We find that the level of the participation rate is predominately determined by the income factor, followed by various measures of social communication. Social communication plays the most important role in the change of the participation rate, acting as a multiplier to stimulate stock market participation. The effects are more pronounced in high‐income, high‐education, high‐population‐density groups and during the bull market period.     

Islamic legal methodologies and Shariah screening standards: Application in the Indonesian stock market

This article provides a framework for applying the principles of Islamic legal methodology to determine the optimal Shariah screening standards for Islamic equity markets. It is argued that using maslahah mursalah (unrestricted benefit) is an appropriate method for identifying appropriate financial standards and its principles stipulate that the benchmark that yields the best economic returns to investors should be chosen. The methodological framework is applied to the Indonesia equity market where the economic implications of the Islamic stock screening standards of the Indonesian Islamic Shariah Stock Index and four global indices are assessed. Portfolios are constructed by applying Islamic stock screening standards for each of the indices by using data on 377 stocks listed in the Indonesian stock market for 5 years. The performances measured by the Sharpe ratio, Treynor index, and Jensen alpha reveal that the Dow Jones Islamic Index screening criteria performs the best. Based on the method of maslahah mursalah, the article recommends using the screening standard of this index in the Indonesian stock market to maximize benefits to investors. While the approach used in this article is applied to Islamic equity markets, the methodological framework can also be used for other similar cases in Islamic finance.     

Price monotonicity violations during stock market crashes: Evidence from the SSE 50 ETF options market

This study empirically tests whether price violations, as defined by Bakshi, Cao, and Chen (2000), show different patterns in response to market shocks. Specifically, we analyze the Chinese options market during a period covering a stock market crash and a series of trading restrictions in the Chinese derivatives markets. Our results confirm the significant changes of the defined violations in the face of unexpected shocks, and more importantly, we interpret such variations from the perspective of information spillovers. Our findings suggest that the stock market crash prompts informed traders in the Chinese options market to frequently adjust their positions on put options, exacerbating the misunderstandings and overreactions to new information. Further, the regulatory shock in the derivatives markets diminishes the efficiency of information incorporation for both options and spot markets but does not affect the dominance of the Chinese options market in price discovery.