共查询到20条相似文献，搜索用时 46 毫秒
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CPI是经济生活中的＂晴雨表＂,一般市场经济国家认为CPI在2%～3%属于可接受范围,CPI过高对整个社会经济发展的负面影响较大,而高速度的经济增长同样也会拉高CPI,因此,在国家宏观经济分析中,CPI起着至关重要的作用。文章选取了1990年1月～2013年4月CPI月度数据作为研究对象,通过利用GARCH类模型对进行了实证CPI的波动规律进行了实证分析,以期为国家宏观经济研究提供依据。 相似文献
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文章采用GARCH和EGARCH模型,对国有商业银行股票的收益率波动进行分析,结论表明我国商业股票收益率有尖峰厚尾性、异方差性、波动的持续性和非对称性。 相似文献
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本文基于GARCH模型族,通过对2005年7月20日至2008年12月31目的人民币对美元的高频日汇率数据的实证研究,分析了我国汇率体制改革三年以来人民币对美元汇率的波动特征,并充分结合当前金融危机背景下对我国汇率市场的影响,以说明人民币对美元汇率的基本趋势变化,为制定人民币对美元汇率政策提供了参考。 相似文献
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随着金融全球化和各国金融市场开放,不同金融市场间的相关性日益突出。选取中国及国际股票市场中具有较大影响力的股票指数作为研究对象,分别采用各指标最新的历史数据对各金融市场的波动性以及不同金融市场间的波动相关性进行研究。 相似文献
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长期以来资产收益率的波动性一直都是金融学家关注的问题,资产选择理论用方差来描述收益率的波动性,进而寻找最优资产组合。传统的金融计量方法认为方差是独立于时间变化的变量,但是近年来大量的金融时间序列实证分析发现,方差是随时间变化而变化的,而且金融时间序列的波动具有类聚性。近年来,一些学者把GARCH模型与Copula结合,动态地对金融变量间的相依性和风险加以研究。本文将结合两者的实证分析进行比较。 相似文献
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本文采用非线性GARCH模型研究中国股票市场的波动性。实证结果表明,非线性GARCH模型较传统的线性GARCH模型显著提高了股票市场波动性的描述与预测能力,且非线性GARCH模型的VaR值具有较高的精度,其中以ANSTGARCH模型的效果为最佳。 相似文献
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本文运用Granger因果检验和扩展GARCH模型实证研究了深圳A股市场交易量与股价之间的关系。得到了如下结论:交易量变量和收益率、波动率存在双向Granger因果关系;交易量只能在有限程度内解释波动率的持续性,深圳股市还存在其他影响波动率持续性的因素。 相似文献
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股指期货引入对股票市场波动的影响分析 总被引：1，自引：0，他引：1
股指期货的推出是否对其标的资产的波动性有显著的影响一直以来在学术界存在争议。利用改进的GARCH模型分析我国股指期货推出后对现货市场波动性的影响,表明我国推出股指期货后在较短时间没有增加现货市场的波动性。 相似文献
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Umar Bida Ndako 《Journal Of African Business》2013,14(1):47-57
This article examines the dynamic relationship between stock prices and exchange rates for five Sub-Saharan African financial markets: Ghana, Kenya, Mauritius, Nigeria and South Africa. It uses weekly data, covering the floating exchange rate regime from January 14, 2000, to December 31, 2009, and applies both the Vector Autoregression and the Dynamic Conditional Correlation models. Results from the Vector Autoregression model suggest no evidence of cointegration between stock prices and real exchange rates for all the five countries in the sample. Results from the dynamic conditional correlation show that the correlation coefficients are not constant for the period under study, and the estimates largely show a negative time-varying correlation for all the countries except Ghana that indicates a positive correlation. 相似文献
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This study investigates the impact of uncertainty on the volatility forecasting power of option-implied volatility. Option-implied volatility is a powerful predictor of future volatility, particularly during periods of high uncertainty. This is consistent with option-implied volatility being largely determined by volatility-informed traders (rather than directional traders) when uncertainty is high. New volatility forecasting models that incorporate such interaction outperform benchmark models, both in- and out-of-sample. The new models also better predict future volatility during the 2008 global financial crisis, for which benchmark models perform poorly. The results are robust to alternative choices of benchmark models, loss functions, and estimation windows. 相似文献
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Using an extended LHARG model proposed by Majewski et al. (2015, J Econ, 187, 521–531), we derive the closed-form pricing formulas for both the Chicago Board Options Exchange VIX term structure and VIX futures with different maturities. Our empirical results suggest that the quarterly and yearly components of lagged realized volatility should be added into the model to capture the long-term volatility dynamics. By using the realized volatility based on high-frequency data, the proposed model provides superior pricing performance compared with the classic Heston–Nandi GARCH model under a variance-dependent pricing kernel, both in-sample and out-of-sample. The improvement is more pronounced during high volatility periods. 相似文献
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This paper evaluates the ability of alternative option-implied volatility measures to forecast crude-oil return volatility. We find that a corridor implied volatility measure that aggregates information from a narrow range of option contracts consistently outperforms forecasts obtained by the popular Black–Scholes and model-free volatility expectations, as well as those generated by a realized volatility model. This measure ranks favorably in regression-based tests, delivers the lowest forecast errors under different loss functions, and generates economically significant gains in volatility timing exercises. Our results also show that the Chicago Board Options Exchange's “oil-VIX” index performs poorly, as it routinely produces the least accurate forecasts. 相似文献
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In this paper, we examine and compare the performance of a variety of continuous‐time volatility models in their ability to capture the behavior of the VIX. The “3/2‐ model” with a diffusion structure which allows the volatility of volatility changes to be highly sensitive to the actual level of volatility is found to outperform all other popular models tested. Analytic solutions for option prices on the VIX under the 3/2‐model are developed and then used to calibrate at‐the‐money market option prices. 相似文献
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Long memory in continuous-time stochastic volatility models 总被引：10，自引：0，他引：10
This paper studies a classical extension of the Black and Scholes model for option pricing, often known as the Hull and White model. Our specification is that the volatility process is assumed not only to be stochastic, but also to have long-memory features and properties. We study here the implications of this continuous-time long-memory model, both for the volatility process itself as well as for the global asset price process. We also compare our model with some discrete time approximations. Then the issue of option pricing is addressed by looking at theoretical formulas and properties of the implicit volatilities as well as statistical inference tractability. Lastly, we provide a few simulation experiments to illustrate our results. 相似文献
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Raphael Braga da Silva Bernardo Prôa Bressane Alessandra Pasqualina Viola Antonio Carlos Figueiredo Pinto T. Diana L. van Aduard de Macedo Soares 《Latin American Business Review》2013,14(4):311-328
Based on studies of idiosyncratic volatility developed in the recent literature, this study analyzes its relation with expected returns through the breakdown of idiosyncratic volatility in the Brazilian stock market and presents evidence of the importance of expected idiosyncratic volatility for asset pricing. We study the impact of the expected and unexpected components of idiosyncratic volatility on the returns of shares listed on the BOVESPA between 2004 and 2011. The results show a strong positive and significant relation between expected idiosyncratic volatility and returns. This evidence is highlighted when we use unexpected idiosyncratic volatility to control for unexpected returns. Additional robustness tests, controlling for size and momentum effects, also have positive and significant coefficients, corroborating previous findings. 相似文献
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This paper studies the forecasting of volatility index (VIX) and the pricing of its futures by a generalized affine realized volatility model proposed by Christoffersen et al. This model is a weighted average of a GARCH and a pure realized variance (RV) model that incorporates each volatility component into the new dynamics. We rewrite the VIX in terms of both volatility components and then derive closed‐form formulas for the VIX forecasting and its futures pricing. Our empirical studies find that a unification of the GARCH and the RV in the modeling substantially improves the forecasting of this index and the pricing of its futures. 相似文献
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