后危机时代中国股市波动性解析:基于GARCH模型族研究

波动性是衡量股市风险和稳定的重要指标之一,对股市的健康发展具有重要影响。文章以上证指数为研究标的,利用GARCH族模型对股市的波动性进行了比较研究。结果表明,后危机时代,中国股市收益率波动确实存在非对称现象,EGARCH模型比TGARCH模型更能适合刻画中国股市的特征,但GARCH模型族存在伪持续,尚待改进。     

沪深股市的波动性分析——基于t分布下GARCH和SV模型的比较

构建基于N分布和t分布下的GARCH(1,1)和SV模型,并通过实证分析探讨了上证指数和深证成指收益序列的波动性.分析结果表明,GARCH(1,1)类模型和SV类模型能较好地拟合沪深股市收益率的波动,并指出我国股市存在较强的波动持续性;而基于t分布的各模型能有效地刻画股市的厚尾性;此外,通过计算VaR值,说明深市比沪市的风险更大,且SV类模型能更准确地反映收益率的风险特性.     

上证指数收益率波动的实证分析——基于ARCH族模型

利用ARCH族模型对上证指数股票收益率进行定量与定性分析,表明上证指数日收益率存在高阶的ARCH效应,条件方差对日收益率有很强的影响,其中EGARCH模型在反映股市波动性方面优于其他模型.     

上证综指收益率波动性的非线性方法研究

以上证综指日收盘价为样本建立了对上证综指收益率波动性的非线性模型.实证结果表明我国上海股市的价格波动具有异方差性及显著的左尖峰厚尾的特征;收益率的波动不服从正态分布;具有集聚性和记忆性;波动持续时间较长.通过分析比较GARCH模型拟合效果较好,并预测结果有一定的稳定性.同时对收益率建立了EGARCH（1,1）和TARCH（1,1）模型,表明收益率波动存在一定的杠杆效应.     

基于GARCH类模型和BP神经网络的量价关系实证研究

作者以量价关系相关理论为基础,使用EGARCH模型和BP神经网络对中国股市的量价关系进行了实证研究.EGARCH模型的参数估计结果显示加入交易量的模型更优.然后作者得到了上证指数的如下量价关系特征:非预期成交量与股市波动性之间存在较强的正相关关系且我国股市收益率的波动存在明显的"杠杆效应".因而加入交易量的BP模型具有更小的均方误差.     

股市波动的周内效应研究

收益与风险共存，以往对股市的周内效应研究仅集中在收益率上，对股市的另一特征波动性的周内效应进行了实证研究。应用无条件波动的修正Levene检验和条件波动的GARCH模型，研究了上证综合指数，结果显示我国股市存在显的星期一高波动现象，利用混合分布模型对此现象进行了解释，周末信息的积累对星期一交易的影响可能是其高波动的原因。     

TARCH-M模型在上证指数波动率的实证分析

本文应用TARCH-M模型,并且引入迭代累计平方和(ICSS)法则对上证指数进行波动时段进行划分,针对不同波动时段分析其上证指数日收益率上涨和下跌对上海股票市场非对称的影响特点.结果表明,上海股市在1997年以前,收益率的上涨比下跌对股市造成的影响更大,即与通常定义的“杠杆效应”相反;而在1997年以后,其“杠杆效应”才显著.此外,收益率和波动性在后两阶段出现明显的正相关关系,说明了投资者正从以前盲目投资逐渐转变为理性投资,上海股市已日趋成为一个成熟的市场.     

GARCH模型分析股票市场的波动性

本文全面比较了描述波动率的各种模型以检验各种模型设定在改善模型表现、降低模型误差方面的作用并运用GARCH族模型对深证成指收益率的波动性进行研究,分析了我国股市波动性的特点。通过比较发现对于深市股指收益率的波动性,EGARCH（1,1）模型能很好的拟合。同时还对股指收益率的波动性进行了预测分析。     

基于GARCH族模型的我国股市波动性研究

选取1996年12月16日到2015年5月19日期间上证综指和深证成指日收益率数据,建立二变量指标的GARCH模型、TARCH模型和EGARCH模型,对我国股市的波动性进行实证分析.结果发现:EGARCH模型能较好地拟合沪深两市日收益率波动的时间序列,而且我国股市存在显著的非对称性,表现为股票市场上投资者对利好消息的反应小于对同等程度的利空消息的反应.     

沪市180指数波动的实证研究

本文将ARCH族模型运用于我国上海股票市场的实证分析,从实证结果中选择适合上证指数收益率序列的模型,我们得出运用GARCH（1,1）-t模型对上证180指数收益率序列进行刻画较为合适．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with