组合证券投资理论发展与统计方法的应用

组合证券投资是分散投资风险的有效途径。投资收益的高低与风险的大小,是每个投资者都必须考虑的问题。投资者总是在一定预期收益及风险水平上选择证券投资方法。通过对每种证券的期望回报率、回报率的方差和每一证券及其他证券之间回报率的相互关系来进行适当分析,辩识出有效投资组合在理论上是同行的。本文在对组合投资理论的发展进行介绍和评述的基础上,给出了统计方法在组合证券投资中的应用。     

投资组合理论研究

投资组合理论在西方的投资研究中,是个比较成熟的理论,投资者应用组合投资的方法,能够有效地降低整体投资的风险,这点已被无数事实所证明,特别是现在我们可从数学上证明这个理论的正确性。随着我国经济体制的改革,投资资金来源和投放的多元化,使得银行和投资部门总是在贯彻国家政策的前提下,力保投资的效果,同时广大企业也都十分重视投资资金的使用,努力降低投资风险。因此,研究投资组合理论,并且用它来指导投资实践,则不论是在理论上,而且在实际工作中,都是有一定意义的。一、风险的表征在现代投资理论中,人们所说的投资风…     

基于效用最大化的投资组合旋转算法研究

文章综合考虑投资组合的期望收益率和风险(方差),提出了基于效用最大化的投资组合模型,并用线性不等式组的旋转算法进行求解.计算结果表明,在允许卖空的情况下,风险偏好系数能够在整个变化范围内较好地反映投资者的期望收益率,而在不允许卖空情况下,风险偏好系数只能在某个区间起作用.因此,投资者应结合自己的风险偏好和投资组合的期望收益率作出决策.文章运用自编程序能够很快地计算出各种不同的风险偏好系数所对应的有效投资组合,以帮助投资者得到最优投资策略.所运用的线性不等式组的一种旋转算法避免了通常处理二次规划问题所需的松弛变量、剩余变量和人工变量,操作简便、计算效率高.     

房地产投资组合理论的研究

一、风险最小投资组合模型的建立 1.房地产投资组合的收益与风险。 （1）投资组合的期望收益率。 投资组合期望收益率E（RP）可定义为组合中各投资项目期望收益率的加权平均。设E（Ri）为第i类房地产投资的期望收益率；     

国际投资组合选择理论研究进展

国际投资组合选择理论研究的是在一定的假设条件下,当经济实现均衡时,投资者所应持有的本国与外国金融资产的比例。它的发展有5个特征:从追求金融市场的局部均衡到追求经济的一般均衡;从不考虑投资者的存在到考虑投资者个人效用的最大化;从单纯的理论模型构建到结合现实数据进行实证检验;从假设金融市场完全到考虑金融市场不完全的情况;从假设金融市场一体化到考虑金融市场存在分割的情况。     

基于双拐点预期理论的资产组合选择问题

文章在双拐点预期理论的研究框架下进行资产组合选择问题的研究。首先将传统金融学中的随机占优分析方法推广到行为金融学的研究中,基于双拐点预期理论提出了双拐点预期理论随机占优的判断方法。随后运用新的随机占优方法对双拐点预期理论框架下的资产组合选择问题进行分析,与以往的研究不同,文章的结论说明尽管均值方差理论和双拐点预期理论分别隶属于传统金融学与行为金融学,两个理论框架存在较大的分歧,但在有效组合选择问题上两者却达成了惊人的一致。这为传统金融学与行为金融学的融合的可能性提供了新的证据。     

基于马科维茨理论的投资组合最优化

随着中国经济的发展和人民生活水平的提高,市场经济体制的确立和发展,增大了个人在未来生活的不确定性及风险,促使人们产生进行个人投资的需求.个人投资者在选择投资组合时要秉承"鸡蛋要放进不同篮子"的理念,达到均衡风险管理,增强投资稳定性的目的,根据自身的需要来通过组合投资的方法来减少系统风险,并追求最高的投资回报率.本文运用马科维茨理论模型,首先选取中材节能、天津港两只股票为例,来计算最优风险资产组合中各自的占比,再次引入无风险资产,将无风险资产与最优风险资产组合进行结合.     

网络治理：理论的发展与实践的效用

网络治理作为一种新的治理形式，具有组织与过程整合的特征。网络治理研究应以中间组织理论为基础，并从三维结构扩展到四维框架，来探讨网络治理的生成环境与构建网络治理结构的理论体系。而网络治理的实践，已从关系的效用延伸至战略决策。     

Subjective Expected Utility Theory with State-Dependent Preferences

This paper extends Savage′s subjective expected utility theory to include state-dependent preferences. The dependence of the decision maker′s preferences over consequences on the states of nature is represented by state-specific mappings of the set of consequences onto itself. Within this framework Savage′s postulates are reformulated and it is shown that there exist subjective expected utility representations of the preference relation over acts with unique, nonatomic, probability measure on the algebra of all events, and a state-dependent utility function over the set of consequences. Journal of Economic Literature Classification Number: D81.     

The Endowment Effect and Expected Utility

The endowment effect, which is well documented in the contingent valuation literature, alters people's preferences according to a reference point established in an elicitation question. In particular, the utility that people place on a bundle is both a positive function of the quantities of the goods comprising the bundle, and a negative function of any loss (real or hypothetical) that the elicitation question asks them to incur. Biases such as this have lead some to reject the contingent valuation method as a means of quantifying costs and benefits in favour of other methods of preference elicitation such as standard gambles. But, most preference elicitation methods used by economists require people to express their preferences for one good in terms of their willingness to forego some of another good. Consequently, it is reasonable to expect that, and prudent to check whether, an endowment effect is also evident in other methods of preference elicitation such as von Neumann-Morgenstern's standard gambles. Internal inconsistencies in the standard gamble method from the experimental economics literature and from a study into the value of non-fatal road injuries are shown to be evidence that an endowment effect is also at work in standard gambles.     

Mixed-Strategy Nash Equilibrium Based upon Expected Utility and Quadratic Utility

The notion of a mixed-strategy Nash equilibrium suffers from three inherent difficulties. First, given the equilibrium strategies of other players, there are many best replies. Second, the equilibrium is unstable. Third, comparative statics results are counterintuitive. We demonstrate that these difficulties all have their origin in von Neumann and Morgenstern′s expected utility. In contrast, players with "quadratic utility" have unique best replies and the Nash equilibrium appears to yield intuitive comparative statics results. Journal of Economic Literature Classification Number: C72.     

证券投资风险计量理论评述

证券投资是一种高风险高收益的金融投资。自Markowitz创立投资组合理论以来，对证券投资风险计量的研究一直是金融投资研究的热点问题之一。本文对现有计量理论进行评述，并对它们之间的关系进行分析，为证券投资风险计量的进一步研究提供基础。     

On Professor Kohn and Expected Utility: Correction and Clarification

As a result of an oversight and narrow assumption, Kohn and Hollenhorst (1988) Derive an equation that does not hold in general and that leads to some erroneous Inferences when relied upon in Kohn (1999). The purpose of this note is to identify And clarify the problem and its source, and to draw the appropriate inferences. [D80, Q25]     

On Professor Kohn and Expected Utility: Correction and Clarification-Rejoinder

Professor Horowitz correctly identifies the limitation of my assuming separable utility functions to derive a marginal condition for efficiency under uncertainty. Correction this limitation, he provides a simple but powerful condition that encompasses the nonseparable as well as the separable case. This condition replaces the dubious Equation (14) derived in Kohn (1999). In a departure from von Neumann-Morgenstern theory, for cases in which the decisions of a risk-averse community are compared with those it would make were it risk-neutral, it is proposed here that the same utility function holds for risk-neutrality as for risk-aversion, but that the stochastic quantities be replaced by their expected value in the former. [Q25]     

证券投资组合理论在中国的运用

本文分析了建立现代证券投资组合（Portfolio)理论的基本假设，对假设中的市场效率，风测度，参数估计时效性，零交易费用等，提出了马科维茨（Markowitz)证券组合理论在我国运用存在的主要问题，并对组合证券投资优化模型的改进提出了自己的思路。