共查询到20条相似文献，搜索用时 0 毫秒
1.
In this paper we demonstrate that the measurement of stock market efficiency is an important activity in establishing whether eastern European countries satisfy the Copenhagen Criteria for EU membership. Specifically, we argue that developing an efficient stock market should be an important policy focus for countries with aspirations to join the EU as it helps to demonstrate the existence of a functioning market economy. We illustrate this issue by examining the evolution of stock market efficiency in the Bucharest Stock Exchange from mid-1997 to September 2002. We use a GARCH model on daily price data and model the disturbances using the Student-t distribution to allow for ‘fat-tails’. We find strong evidence of inefficiency in the Bucharest Stock Exchange in that the lagged stock price index is a significant predictor of the current price index. This result is robust to the inclusion of variables controlling for calendar effects of the sort that have been observed in more developed stock markets. The level of inefficiency appears to diminish over time and we find evidence consistent with stock market efficiency in Romania after January 2000. 相似文献
2.
《International Journal of Forecasting》2023,39(3):1318-1332
This paper constructs an aligned global economic policy uncertainty (GEPU) index based on a modified machine learning approach. We find that the aligned GEPU index is an informative predictor for forecasting crude oil market volatility both in- and out-of-sample. Compared to general GEPU indices without supervised learning, well-recognized economic variables, and other popular uncertainty indicators, the aligned GEPU index is rather powerful and can provide preponderant or complementary information. The trading strategy based on the aligned GEPU index can also generate sizable economic gains. The statistical source of the aligned GEPU index’s predictive power is that it can learn both the magnitude and sign of national EPU variables’ predictive ability and thus yields reasonable and informative loadings. On the other hand, the economic driving force probably stems from the ability for forecasting the shocks of oil-related fundamentals. 相似文献
3.
In this paper, we employ partial- and multiple-wavelet coherence analyses to examine co-movement between international stock markets by considering the influence of crude oil in a time domain perspective. Overall, we find that crude oil is a major factor driving co-movement between international stock markets in the median and long term. However, when considering the oil-importing and oil-exporting countries differently, we still find that crude oil is a driver for interdependence between oil-importing and oil-exporting countries. In contrast, the crude oil has relative lower impact on the co-movement in oil-importing or in oil-exporting countries, which indicates its co-movement is caused by other factors. In addition, Gulf Cooperation Council stock market may lead the stock markets of oil-importing countries in the long term. Our empirical results provide meaningful information for investors and policymakers. 相似文献
4.
随着能源金融化程度不断加深,国际能源市场和股票市场之间的联系日益密切。采用TVP-VAR-DY溢出指数分解方法探究国际能源市场和股票市场之间的时变溢出关系,在此基础上进一步探究跨市场溢出效应的主要驱动因素。研究结果表明：国际能源市场与股票市场既存在显著的市场内部溢出效应,也存在显著的跨市场溢出效应,且系统总体溢出水平的动态变化主要由后者驱动;国际能源市场对股票市场的溢出效应弱于股票市场对能源市场的溢出,即国际能源市场为溢出净接收者。国际金融危机、COVID-19等极端风险事件发生时,跨市场波动溢出效应显著增强;地缘政治风险和全球经济政策不确定性是导致跨市场波动溢出的重要因素,且分别在金融市场动荡时期、全球流动性收紧时期表现得更加明显。鉴于此,投资者应高度重视两个市场之间的波动溢出风险,当极端经济事件发生时,监管部门应采取必要的非常规政策措施,减轻溢出效应的不利影响,防范化解系统性金融风险。 相似文献
5.
6.
《International Journal of Forecasting》2023,39(2):659-673
To improve the predictability of crude oil futures market returns, this paper proposes a new combination approach based on principal component analysis (PCA). The PCA combination approach combines individual forecasts given by all PCA subset regression models that use all potential predictor subsets to construct PCA indexes. The proposed method can not only guard against over-fitting by employing the PCA technique but also reduce forecast variance due to extensive forecast combinations, thus benefiting from both the combination of information and the combination of forecasts. Showing impressive out-of-sample forecasting performance, the PCA combination approach outperforms a benchmark model and many related competing models. Furthermore, a mean–variance investor can realize sizeable utility gains by using the PCA combination forecasts relative to the competing forecasts from an asset allocation perspective. 相似文献
7.
In this article, we provide a structured review of crude oil price dynamics. Specifically, we summarize evidence on important factors determining oil prices, cover the impact of oil market shocks on the macro economy and the stock market, discuss how the financialization of crude oil markets affects oil market functionality and efficiency, and we then outline approaches for forecasting crude oil prices and volatility. By comparing the results of the most influential early contributions and recent studies, we can identify important developments and research gaps in each field. Thus, our review provides academics and practitioners newly engaging in crude oil research with an overview of what scientists know about crude oil dynamics and highlights which topics areparticularly promising for future research. 相似文献
8.
Owing to the asymmetry of stock markets, this study investigates the dependence structures for six regional stock markets according to different market conditions by applying the unconditional quantile regression (UQR) approach. This approach can address the traditional conditional quantile regression (CQR) approach’s limitation that its distributions are defined conditional on specific covariates. Specifically, we not only examine the detailed linkages among these six regional stock markets, but also explore the effect of global economic factors on them, given the strengthening of both international investment and the globalization of financial markets. The results show these dependence structures are often an asymmetric U-shaped or inverted U-shaped structure, which indicates that the impacts of both other geographically and economically close stock markets and economic factors are more pronounced during bear and bull markets than during normal markets, especially so in bear markets. Moreover, the UQR approach provides stronger extreme-value relationships and more significant asymmetric effects than the traditional CQR approach. 相似文献
9.
10.
近年来随着股市的下跌,国内各证券公司的自营风险逐步暴露出来。这也为我国证券业风险管理提出新的课题。本文主要对VAR方法介绍,以及VAR在股票市场上的应用分析,以供投资者借鉴。 相似文献
11.
《International Journal of Forecasting》2023,39(1):486-502
This paper aims to improve the predictability of aggregate oil market volatility with a substantially large macroeconomic database, including 127 macro variables. To this end, we use machine learning from both the variable selection (VS) and common factor (i.e., dimension reduction) perspectives. We first use the lasso, elastic net (ENet), and two conventional supervised learning approaches based on the significance level of predictors’ regression coefficients and the incremental R-square to select useful predictors relevant to forecasting oil market volatility. We then rely on the principal component analysis (PCA) to extract a common factor from the selected predictors. Finally, we augment the autoregression (AR) benchmark model by including the supervised PCA common index. Our empirical results show that the supervised PCA regression model can successfully predict oil market volatility both in-sample and out-of-sample. Also, the recommended models can yield forecasting gains in both statistical and economic perspectives. We further shed light on the nature of VS over time. In particular, option-implied volatility is always the most powerful predictor. 相似文献
12.
有效市场假说理论是股票市场理论研究的基础之一,股票市场的有效性对政府的监管和投资者的投资策略都有着重要影响。本文选取2006年至2010年上海股票市场的一系列指数的日收盘价进行游程检验,得出上海股票市场是弱式有效市场的结论。 相似文献
13.
为了研究沪港通对沪市股票市场有效性的影响,本文选取2000—2015年上证股指,运用 R／S 分析并结合 DFA 统计量得出：沪市股票市场存在明显的长期记忆性,但沪港通之后其长期和短期记忆性显著下降。基于 ARFIMA 模型的预测效果与长期记忆性特征之间得出对应关系：如果长期记忆性显著,则预测效果好;如果记忆性不明显,则预测效果差。本文对沪港通前后进行长度为10步的分数阶自回归模型预测,结果显示 ARFIMA 模型对沪指收益率整体的预测效果较好,但沪港通开通之后模型的预测效果却明显减弱。 相似文献
14.
构建了一个高效工业体系框架,既改进企业内部工业系统运行效率,强调系统经济运行的管理和监督,又促进外部市场的运作模式从产品单体交易到工业系统优化服务的转变,最终实现高效工业市场的转型。 相似文献
15.
In this study, we investigate the dependence structures between six Chinese stock markets and the international financial market including possible safe haven assets and global economic factors under different market conditions and investment horizons. The research is conducted by combining a quantile regression approach with a wavelet decomposition analysis. Although we find little or insignificant dependence under short investment horizons, we detect the strong asymmetric dependence of oil prices and the US dollar index on the six Chinese stock markets in the medium and long terms. Moreover, not only is crude oil not a safe haven, it may damage Chinese stock markets as it increases over the long term, even in bull markets. Meanwhile, appreciation of the US dollar (depreciation of RMB) damages (boosts) Chinese stock markets during bull (bear) market conditions under long investment horizons. Moreover, we find that VIX (volatility index)-related derivatives may serve as good risk management tools under any market condition, while gold is a safe haven asset only during crisis periods. 相似文献
16.
随着金融体制改革的不断深入,资本市场法律法规体系的建立健全和证监会监管能力的提高熏我国已具备了一定的推出新的金融衍生产品的市场条件,文章结合股指期货的功能和作用与我国股票市场的实际情况,分析了目前在我国开展股指期货交易的可行性。 相似文献
17.
本文证实我国股市的投资者们长期存在对股票历史业绩的反应过度现象。我们发现历史上拥有最高收益率的股票在之后业绩都表现不佳。其主要原因是我国股市的投资者们在做投资选择时都遵循一条简单的规则:即在其他条件都相同的情况下,选择拥有最高的历史收益率的股票进行投资。集中投资使拥有最高的历史收益率的股票被过高评价,导致其后来的业绩表现要比那些拥有较低历史收益率的股票差。我们称之为"最大值效应"。通过使用Fama and Macbeth(1973)横断面回归分析方法,我们确认了"最大值效应"要比CAPM理论,Blitz and Pim van Vliet(2007)发现的"波动性效应"等更为有效地解释我国股市横断面股票收益率。 相似文献
18.
本文借鉴并且利用了中外学者对于货币政策与证券市场波动相关性的研究成果,运用了多元统计分析中的因子方 法对中国证券市场景气指数进行了一些探讨性研究。得到先行、一致、滞后三类指标,并且对所得景气指数进行了分析,得出的 结果比较令人满意。 相似文献
19.
以沪港通政策实施为现实背景,选定2012年11月至2016年11月为研究区间,构造股价信息充分性、股价信息准确性和股价对信息的反应速度三项定价效率核心指标,采用双重差分模型实证检验沪港通政策对我国沪市A股定价效率的影响。研究发现,沪港通政策的推出有助于提高我国沪市A股的股价信息充分性、准确性和股价对信息的反应速度,且对国有企业、高股权制衡度企业、高换手率企业的股票定价效率提高更显著。进一步对比发现,资金双向流动交易机制对沪市A股定价效率的影响具有差异性。因此,应有序扩大沪股通、港股通标的股票范围,不断完善资金双向流动机制,提高股票流动性,加速境内外资本市场接轨。 相似文献
20.
The paper finds recent financial crisis has changed permanently the correlations between BRICS and developed U.S. and Europe stock markets. 70% of BRICS stock markets⿿ conditional correlation series demonstrate an upward long-run trend with the developed stock markets. Our results provide convincing evidence that the reducing diversification benefits are a long-run and world-wide phenomenon, especially after recent financial crisis. 相似文献