基于Copula-GARCH-EVT的中国开放式基金投资组合风险度量

文章结合CARCH模型和EVT理论刻画了单个金融资产收益率的波动性和尾部分布,并将Copula函数和Monte Carlo技术应用于证券投资组合的VaR计算方法.通过对光大红利基金的实证研究,得到前十大重仓中单只股票及其投资组合的风险值,结果表明,基于Copula-GARCH-EVT的VaR方法具有重要的经济应用价值.     

VaR视角下金融市场风险测度统计研究

本文针对金融市场风险测度理论进行概述,论述传统的测度方法及不足,同时对VaR法测度进行论述,阐述了金融资产组合的VaR值测度,同时以利率风险为例,分析利率VaR值的测度公式,并指出一些不足。     

基于Copula-VaR的金融资产组合风险测度研究

引入Copula函数来改进传统的VaR方法,构建出Copula-VaR模型。通过蒙特卡罗模拟实证金融资产组合收益的各种VaR值,结果表明,Copula-VaR模型能够更精确地测度出金融资产组合的在险价值风险。     

基于贝叶斯方法与时变Copula模型的基金风险的度量

基于贝叶斯理论的 MCMC方法对单个基金收益率进行 GARCH 建模,以及对投资组合权重进行后验模拟.进一步结合时变Copula理论计算基金投资组合的 VaR,与基于极大似然法的结果进行比较.实证结果表明基于贝叶斯理论的时变Copula的 VaR方法,能够更有效的度量开放式基金投资组合的风险.     

基于GARCH—VaR模型对社保基金投资风险的度量

利用VaR方法对我国入市的社保基金投资风险进行度量的结果表明,社保基金收益率和证券市场的风险程度及投资结构相关。为了控制风险并达到保值、增值的目的,社保基金投资应控制证券投资比例,实施多元化投资策略。     

全国社保基金投资组合绩效评价理论综述

对全国社保基金以及全国社保基金投资组合绩效评价的有关理论进行了总结,分析了现代投资组合理论与组合绩效的衡量方法,Markowitz的均值一方差模型为有效衡量和测度投资组合的绩效表现奠定了重要的理论基础,在此基础上分析了CAPM模型、古典单因素评估模型、组合时变性评估模型、条件绩效模型和其他相关理论研究,为全国社保基金投资组合绩效评价的深入展开作出必要的准备和铺垫。     

基于Copula-ES度量股票型基金投资组合风险

由于许多金融资产收益率的波动可能存在非对称性,本文通过对收益率采用GARCH或者EGARCH建模,对存在杠杠效应的金融资产采用EGARCH建模.并将Copula函数和Monte Carlo技术应用于融通深证100基金,计算得到其前十大重仓的股票及其投资组合的风险值VaR以及ES,结果表明,基于Copula-Es的风险度量方法可以为我国基金管理公司评估和管理市场风险,从而控制和减少资产损失提供参考.     

基于加权CVaR下具有不确定退出时间的最优投资组合研究

一、引言 VaR是指在一定的概率(置信)水平下,某一金融资产或投资组合在未来特定的一段时间内遭受的最大可能损失.但是经过后来的研究,发现了VaR具有很多不足之处,于是Artzner(1997)提出了CVaR,CVaR是指投资组合的损失大于某个给定VaR值的条件下,该投资组合的损失平均值.2000年Rockafeller等人证明了基于CVaR的投资组合优化必定存在最小风险的解.CVaR和VaR作为风险测量工具在文献[3]中作了广泛的比较,CVaR现在被认为是比VaR更好的一致性风险度量.     

CVaR风险度量及投资组合优化的实证分析

CVaR法是在VaR法基础上优化改进而来的风险度量方法。通过CVaR法对金融资产风险进行评估,对投资组合资产配置进行优化等成为了金融风险管理的重要内容。本文首先对比了CVaR和VaR法的区别,并通过比较A股和H股收益分布的特征得出A股更适用CVaR模型的结论。通过多因子选股模型选出投资组合成分,再使用均值-CVaR模型对投资组合进行优化,最终得到不同置信度和阀值下投资组合的优化结果。从而证明了该模型的有效性,突出了CVaR法在国内证券市场的使用价值和意义。     

基于VaR我国阳光私募基金市场风险研究

VaR方法称为风险价值模型,VaR模型测量风险简洁明了,统一了风险计量标准,VaR度量金融风险受到普遍关注。本文以阳光私募基金的风险度量作为研究对象,基于VaR方法,通过计算不同模型的不同分布值,论证GARCH模型能较好解决残差异方差问题以及分析阳光私募基金市场存在的投资风险问题。     

金融危机对拉美国家私营养老金的影响及经验启示

2008年爆发的金融危机对全球经济产生了重要影响,也对拉美国家私营养老金制度的发展产生了巨大冲击。文章介绍了拉美国家私营养老金制度的改革路径和养老基金概况,从养老金资产价值、投资收益率、投资组合、雇员、制度覆盖面和缴费密度方面切入,分析了金融危机对拉美私营养老金制度的影响。在现状分析的基础上,得出了要保障私营养老金制度可持续运行的一些经验启示:构建多元化的混合型养老金体系,增强退休和养老金支付的灵活性,积极运用生命周期投资策略,实施多元化和分散化投资,以养老金长期收益作为投资目标,建立社会风险应急储备基金和政府担保机制,以及加强员工退休教育。     

论社保资金进入证券市场的意义与途径

国企改革的作用越来越被人们所认识，巨大的社会保障支出要求寻找提高社会资金管理效率、使社保资金保值增值的途径。按照国际惯例，社保资金可以由政府控制的中央基金机构管理，也可以交给专业基金管理公司管理。不论采取哪一种管理方式，社保资金进入证券市场都是最有效的途径之一，社保资金进入证券市场不仅实现自身的保值增值还可促进证券市场的健康发展。     

分级式社会保障理论研究

现有的社会保障理论仍难以很好地满足我国社会保障事业发展的现实需要,所以,还应在理论上进一步创新。分级式社会保障理论的核心是“分级”。“分级”即把社会保障制度分为两级,“一级”是中央政府通过全国社会保障税统一筹集社会保障资金,用于全国城乡人员社会保障之用;另“一级”是省一级政府通过地方社会保障税统一筹集社会保障资金,用于本省区域内城乡人员社会保障之用。     

Polynomial goal programming and the implicit higher moment preferences of US institutional investors in hedge funds

Polynomial goal programming (PGP) is a flexible method that allows investor preferences for different moments of the return distribution of financial assets to be included in the portfolio optimization. The method is intuitive and particularly suitable for incorporating investor preferences in higher moments of the return distribution. However, until now, PGP has not been able to meet its full potential because it requires quantification of “real” preference parameters towards those moments. To date, the chosen preference parameters have been selected somewhat “arbitrarily”. Our goal is to calculate implied sets of preference parameters using investors’ choices of and the importance they attribute to risk and performance measures. We use three groups of institutional investors—pension funds, insurance companies, and endowments—and derive implied sets of preference parameters in the context of a hedge fund portfolio optimization. To determine “real” preferences for the higher moments of the portfolio return distribution, we first fit implied preference parameters so that the PGP optimal portfolio is identical to the desired hedge fund portfolio. With the obtained economically justified sets of preference parameters, the well-established PGP framework can be employed more efficiently to derive allocations that satisfy institutional investor expectations for hedge fund investments. Furthermore, the implied preference parameters enable fund of hedge fund managers and other investment managers to derive optimal portfolio allocations based on specific investor expectations. Moreover, the importance of individual moments, as well as their marginal rates of substitution, can be assessed.     

基于余弦相似度(CS)和最小生成树(MST)的基金市场复杂网络研究

以中国基金市场中123家基金公司持有的投资组合为样本,综合运用余弦相似度(CS)和最小生成树(MST)方法,考量基金市场复杂网络。结果显示：各家基金公司持有股票组合的相似程度比持有债券组合的相似程度更高,表明他们持有的债券组合较之股票组合更加多元化,基金公司持有的股票相对集中于市值大、成长性高的公司。同时,全部资产投资组合、股票投资组合和债券投资组合等三类基金MST网络的节点度均服从幂律分布,表明大多数基金公司以少数强影响力基金公司为中心聚集起来,彼此之间具有较强的业务关联。此种网络结构特征可能导致市场风险向基金聚集团体集中,其抵御系统性风险的能力偏弱,也不利于满足投资者的理财多元化需求。     

Performance aspects of Greek bond mutual funds

This paper examines the performance characteristics of Greek bond funds and the impact of fund flows on portfolio returns. The evidence shows that on average bond funds do not offer risk-adjusted profits exceeding the returns of the benchmark index, which is in consistence with the US and international evidence. Returns before fees are slightly superior to the returns of the benchmark index, but when fees are considered they lag considerably. The security selection and market timing skills of fund managers are also tested using both an unconditional and a conditional model to test for the impact of public information variables. We also find that fund flows impact negatively on market timing.     

基于规模与风格的证券投资基金最优组合构建研究

本文选择中国2004年10月1日前成立的8种投资风格共133只证券投资基金,根据其在2005年1月1日-2008年3月31日共161周的数据,依照非回置等权抽样方法构建基金组合。在研究了基金组合规模与组合风险和绩效关系的基础上,着重探讨了基金组合所含风格类型以及基金组合风格丰富化指标与组合风险和绩效的关系。在上述研究的基础上,论文提出了综合规模和风格双因素的基金最优组合构建原则,并得出了最适度风格类型模型和最适度风格丰富化指标模型。     

Reciprocal social influence on investment decisions: behavioral evidence from a group of mutual fund managers

In this paper, I analyze reciprocal social influence on investment decisions in an international group of roughly 2,000 mutual fund managers who invested in companies in the DAX30. Using a robust estimation procedure, I provide empirical evidence that the average fund manager puts 0.69 % more portfolio weight on a particular stock if his or her peers, on average, assign a weight to the corresponding position that is 1 % higher compared to other stocks in the portfolio. The dynamics of this influence on choice of portfolio weights suggest that fund managers adjust their behavior based on the prevailing market situation and are more strongly influenced by others in times of an economic downturn. Analyzing the working locations of the fund managers, I conclude that more than 90 % of the magnitude of influence stems from social learning. Although this form of influence varies a great deal over time, the magnitude of influence resulting from the exchange of opinions is more or less constant.     

Pension Fund Manager Tournaments and Attitudes Towards Corporate Characteristics

Abstract:  This paper explores the relationship between the tournament incentives of pension fund managers and the characteristics of equities they choose to hold. Using a comprehensive data set on pension fund portfolio holdings, we determine the intensity of fund manager tournaments by sorting pension funds into portfolios based on the number of concurrent managers each pension fund employs. We then investigate which corporate characteristics are preferred by each of these portfolios by estimating share selection models that include a range of corporate characteristics that are expected to shape the returns to investment in stocks over the short and long run. We find that the intensity of the tournament faced by fund managers plays a significant role in shaping preferences over corporate characteristics. Managers facing more intense tournaments exhibit significantly weaker preferences for attributes associated with long run payoffs, such as social performance and growth potential, and significantly stronger preferences for short term attributes, such as operational efficiency, when compared to managers that face weak or no tournament incentives.     

我国社保基金运营管理的统计分析与审计监管思考

在对我国社会保障基金的构成与管理,从理论和实践两个层面进行剖析的基础上,以1989-2007年为时间窗口,着重对我国社会保险基金的运营状况进行了统计分析。研究结果显示,我国社保基金覆盖面之广、种类繁多、资金量之大、运营环节多而复杂的现实,为有效监管提出了新的要求,而加强社保资金审计则是社保基金监管效率实现的必然选择。