共查询到20条相似文献，搜索用时 31 毫秒
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本文探讨了将GARCH模型与方差-协方差方法相结合的VaR风险计量方法,并用VaR风险替代Markiwitz组合投资模型中的方差风险,通过求解非线性规划问题,得到最小化股票投资组合VaR风险的最优投资策略。 相似文献
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本文探讨了将GARCH模型与方差-协方差方法相结合的VaR风险计量方法,并用VaR风险替代Markiwitz组合投资模型中的方差风险,通过求解非线性规划问题,得到最小化股票投资组合VaR风险的最优投资策略. 相似文献
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利用Markowitz均值/方差理论Huang Chi-Fu方法,采用定性和定量分析相结合的研究方式,构造一支中国A股市场的最优投资组合,以期为养老金入市提供一种较为科学的投资组合构建方法,即在预期回报可以弥补通胀风险的条件下达到最小风险,并提供相关投资建议。 相似文献
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本文研究了CVaR在投资组合风险中的运用。首先CVaR在投资组合理论中的运用进行了深入的研究,并以此提出了这三种新的分析投资组合风险的方法,对组合CVaR方法进行了有益补充,即边际CVaR,成分CVaR和增量CVaR。最后选取了基金裕阳2006年第三季度的数据进行了实证研究,计算了基金裕阳十大重仓股的边际CVaR、成分CVaR和增量CVaR,然后对这些风险信息进行分析得出调整对策。 相似文献
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徐龙华 《中国商界：上半月》2011,(4):25-25
期望是对取值的平均程度的综合评价,方差是对取值稳定性偏离程度判断的重要指标。期望与方差在投资组合中具有重要作用,为广大的投资者给出了一个评价标准。通过这两种指标的对比,给出较好投资组合。 相似文献
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VaR(在险价值)理论是当今国际上比较成熟的分析和度量风险的理论,在世界范围内得到广泛应用,但在对风险分布函数的度量中,却常常忽视对函数尾部特殊值的分析和计量,从而影响到风险评估的准确性。CVaR作为投资组合风险度量的指标克服了VaR的不足,是一致性的投资组合风险度量指标,具有很多优良特性。目前CVaR尚未成为金融业的一项公认标准,但因为它有厚实的理论根基和鲜明的可操作性,在投资组合风险控制方面比VaR更为有效合理、更适宜,同时建立CVaR模型可以降低风险,使资源合理配置。 相似文献
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组合投资的系统风险与非系统风险——兼评王辉等人的《投资组合风险的分散化研究》 总被引：1，自引：0，他引：1
本文在指出王辉等人的《投资组合风险的分散化研究》一文中出现的错误的基础上,根据资本资产定价模型(CAPM)将组合投资的风险分离为系统风险与非系统风险,最后讨论了组合投资的均值-方差模型。 相似文献
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房地产投资组合模型多以方差或标准差作为风险度量指标。本文从分散风险的角度运用熵的概念,建立了房地产投资组合的熵优化模型,并给出通解,使对房地产投资组合模型的应用更加合理、客观。 相似文献
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Pengyu Wei 《Mathematical Finance》2018,28(4):1020-1060
This article studies the optimal portfolio selection of expected utility‐maximizing investors who must also manage their market‐risk exposures. The risk is measured by a so‐called weighted value‐at‐risk (WVaR) risk measure, which is a generalization of both value‐at‐risk (VaR) and expected shortfall (ES). The feasibility, well‐posedness, and existence of the optimal solution are examined. We obtain the optimal solution (when it exists) and show how risk measures change asset allocation patterns. In particular, we characterize three classes of risk measures: the first class will lead to models that do not admit an optimal solution, the second class can give rise to endogenous portfolio insurance, and the third class, which includes VaR and ES, two popular regulatory risk measures, will allow economic agents to engage in “regulatory capital arbitrage,” incurring larger losses when losses occur. 相似文献
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Optimal Portfolios with Bounded Capital at Risk 总被引：19，自引：0，他引：19
We consider some continuous-time Markowitz type portfolio problems that consist of maximizing expected terminal wealth under the constraint of an upper bound for the capital at risk. In a Black–Scholes setting we obtain closed-form explicit solutions and compare their form and implications to those of the classical continuous-time mean-variance problem. We also consider more general price processes that allow for larger fluctuations in the returns. 相似文献
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This study presents various risk immunization strategies for fixed-income portfolios, including not only classical measures like duration, convexity, and dispersion but also modern measures such as VaR (value-at-risk) and ES (expected shortfall). Empirical tests are conducted in the Brazilian domestic and international bond market. Because it has had one of highest interest rates since the 1990s, Brazil offers an interesting case study for fixed-income studies. Our results are different for domestic and international bonds. For domestic bonds, using the highest convexity criterion to choose the best portfolio is better than using minimum dispersion, and there is a coincidence between the optimum portfolio selected by the convexity, historical VaR, and ES criteria. For international bonds, our findings indicate that the minimum dispersion strategy performs much better than the maximum convexity strategy. The overall performance of portfolios chosen by minimum VaR and ES criteria is also good, with satisfactory realized returns and squared errors. 相似文献
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This paper considers the problem of risk sharing, where a coalition of homogeneous agents, each bearing a random cost, aggregates their costs, and shares the value‐at‐risk of such a risky position. Due to limited distributional information in practice, the joint distribution of agents' random costs is difficult to acquire. The coalition, being aware of the distributional ambiguity, thus evaluates the worst‐case value‐at‐risk within a commonly agreed ambiguity set of the possible joint distributions. Through the lens of cooperative game theory, we show that this coalitional worst‐case value‐at‐risk is subadditive for the popular ambiguity sets in the distributionally robust optimization literature that are based on (i) convex moments or (ii) Wasserstein distance to some reference distributions. In addition, we propose easy‐to‐compute core allocation schemes to share the worst‐case value‐at‐risk. Our results can be readily extended to sharing the worst‐case conditional value‐at‐risk under distributional ambiguity. 相似文献
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董雷萍 《安徽商贸职业技术学院学报(社会科学版)》2020,(1):34-38
通过对新疆2013-2017年的居民家庭金融总资产以及投资和储蓄的分析,从宏观的家庭金融资产视角使用Markowitz的投资组合的均值-方差模型在风算预算的基础上,进一步计算出实际新疆居民每年应当用于储蓄或者用于投资与固定风险和较大风险的比例,即得出风险资产的配置,从而提高新疆居民的储蓄向投资的转化,加强居民金融资产的管理和风险资产的分配,提高居民的风险收益,为新疆居民家庭获取更多金融资产投资于风险性收入提供更好的政策建议。 相似文献
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对项目组合投资问题建立了一个综合决策数学模型,利用优化理论并结合一个具体实例进行了求解。给出的算例为文中的模型和方法作了一个诠释,从理论上得到了一个能使企业获得最大收益的最终投资方案。 相似文献
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Mazin A.M. Al Janabi 《The Service Industries Journal》2013,33(13):2193-2221
This paper proposes a concrete theoretical foundation and a new modelling framework that attempts to tackle the issue of market/liquidity risk and economic-capital estimation at a portfolio level by combining two mutual asset market/liquidity risk models. In essence, this study extends research literature related to the assessment of the asset market/liquidity risk by providing a generalized theoretical modelling underpinning that handle, from the same perspective, market and liquidity risks jointly and integrate both risks into a portfolio setting without a commensurate increase of statistical postulations. As such, we argue that market and liquidity risk components are correlated in most cases and can be integrated into one single market/liquidity framework that consists of two interrelated sub-components. The first component is attributed to the impact of adverse price movements and is modelled based on the concept of liquidity-adjusted value-at-risk framework, while the second component focuses on the risk of variation in transactions costs due to the bid-ask spreads and it attempts to measure the likelihood that it will cost more than expected to liquidate the asset position. As such, the model comprises a new approach to contemplating the impact of time-varying volatility of the bid-ask spread and its upshot on the overall asset market/liquidity risk. The modelling framework can be constructive for financial service industries in emerging-economies and particularly in reinforcing rational economic-capital allocation in light of the aftermaths of the sub-prime financial crisis. 相似文献
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The Liquidity Discount 总被引：8，自引：0，他引：8
This paper characterizes the liquidity discount, the difference between the market value of a trader's position and its value when liquidated. This discount occurs whenever traders face downward sloping demand curves for shares and execution lags in selling shares. This characterization enables one to modify the standard value at risk (VaR) computation to include liquidity risk. 相似文献
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本文以美国1972-2002年的统计数据为例,在建立VAR模型的基础上通过脉冲响应曲线和方差分解表对流入美国的外国直接投资(FDI)、外国证券投资(FPI)和经济增长之间的关系进行了实证研究,结果表明流入美国的FDI和FPI均有助于美国经济的增长。但相对而言,美国经济增长更加依赖于外国证券投资,研究还发现流入美国的FDI与FPI之间关系紧密,两者之间存在积极的良性互动关系,且FPI对FDI的影响明显大于FDI对FPI的影响。 相似文献
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This paper constructs a robust and irreversible investment rule applicable to a series of adjacent models. The project value follows a jump-diffusion process and the investor exhibits complete ambiguity aversion or partial ambiguity aversion to the diffusion, jump amplitude, and jump frequency components. The impact of ambiguity aversion with respect to different components on the optimal investment strategy is examined. The investment decision is mainly driven by ambiguity aversion to the jump amplitude rather than frequency, and an increase in jump intensity leads to the greater importance of ambiguity aversion to jumps. We further show that ambiguity aversion regarding jumps plays a dominant role in determining the investment boundary for low volatility values, and the influence of ambiguity aversion to the diffusion part gradually outweighs that of ambiguity aversion to jumps as volatility grows. 相似文献