基于CVaR的投资组合优化模型研究

风险价值(VaR)是近年来国际金融机构所倡导的测度和控制金融风险的国际主流技术,但是它在投资组合损益服从非正态分布的情形时,不满足一致性风险度量,出现尾部损失测量的非充分性。为了使具有一致性的条件风险值度量(CVaR)克服VaR的不足,构建基于CVaR约束的投资组合优化模型,该模型虑及了投资组合资产的交易成本、交易限制、资金约束和投资者的风险承受度,为制定合理的最优投资组合提供了一种新的思路。     

VaR的改进方法CVaR在投资组合风险中的应用

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。     

VaR和CVaR风险度量方法及最优再保模型

目前,VaR(value-at-risk)和CVaR(conditional value-at-risk)方法是各领域进行风险管理的主要度量工具。本文将VaR、CVaR与传统方差方法进行比较,从是否符合一致性公理来体现VaR和CVaR方法的优越性。并介绍了该两种方法在保险领域的应用,给出了再保险方面的基于VaR和CVaR风险度量的最优再保险模型。     

基于VaR的证券组合优化方法

基于VaR的最优投资决策问题,给出了在VaR约束下的投资组合优化模型。该模型在马柯维茨均值-方差模型的基础上,加入了VaR约束,保证了其风险度量手段与我国金融机构现有投资选择方法在技术上的一致性。     

均值-CVaR模型在正态条件下风险资产组合的研究

条件风险值(CVaR)是指金融资产或其组合的损失额超过VaR的条件均值,它克服了VaR的非一致性,不满足凸性等局限性。给出了在风险证券的预期回报率服从正态分布下的均值-CVaR模型及最小均值-CVaR风险资产组合有解的条件,并在该条件满足下的最小均值-CVaR组合的投资比例向量和最小值。     

VaR在投资组合应用中存在的缺陷与CVaR模型

VaR在投资组合应用中存在的两个缺陷:一是不满足一致性公理,二是尾部损失测量的非充分性,这些缺陷可能导致组合优化上的错误.当且仅当组合回报服从正态分布时,VaR才能应用于组合优化,这极大地限制了VaR在投资组合管理中的适用范围.本文最后介绍了CVaR模对VaR模型的改进及其在投资组合优化中的应用.     

VaR RAROC与投资组合问题探讨

以VaR为风险度量工具、以RAROC作为目标函数的投资决策模型。利用资产回报分布的偏度和峰度 ,对VaR进行调整 ,使它可以应用于非正态分布时的资产组合风险价值估计 ,而不增加计算的复杂性 ;同时又对RARAOC作了修正 ,使之克服了RAROC的缺点。应用此模型 ,使投资组合经理在受到内外部施加VaR限额约束时 ,在上级以RAROC作为投资业绩评估工具的情形下 ,可以有效地实现资产组合的优化配置。     

关于几种金融风险度量模型的评价研究

风险度量方法一直是金融投资研究的热点问题之一,风险定量化研究又是风险管理的中心任务之一,本文针对VaR、CVaR、GRM金融风险度量模型进行了比较研究,并从静态和动态两方面进行了评价,对目前我国金融市场具有重要的借鉴意义。     

基于CDaR理论的社保基金投资风险管理模型

目前,国内社保基金投资风险测量的主流方法VaR和CVaR模型尚存在一些缺陷,有必要将国外风险度量方法CDaR模型引入到国内社保基金的投资风险管理实践,结合我国社会保障基金投资管理条例中的相关投资风险约束条件和国内证券市场的实际情况,形成我国的有投资约束条件下的社保基金风险管理拓展模型。     

我国开放式基金绩效评价研究——基于VaR和CVaR模型的比较测试分析

在RAROC模型中引入CVaR,问题的关键在于计算VaR和CvaR的精度,以及VaR同CVaR的比较测试。通过实证分析,计算VaR和CVaR采取了新的方法即运用GARCH、EGARCH、PARCH模型和残差服从T和GED分布的组合去计算CVaR和VaR的值,并且通过返回性测试来提高VaR和CVaR精度,结果实证检验表明,基于CVaR的RA-ROC更准确的衡量了风险,提高了精确度,为基金投资者提供了一个较好的业绩参考指标。     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."     

Slowdown Trade Surplus Growth

According to Ma Kai＇s economic planning report submitted to the NPC session on March 5th,（Ma Kai is the Minister in charge of the National Development and Reform Commission）,the government has listed the slowdown in trade surplus growth and the steady expansion of external investment as major tasks for 2008.     

Ouyang Riping： A Hero Besides Entrepreneur

A bout fifty years ago. a baby＇s cry broke the sky of quietness, in a small and beautiful town of Hunan province, which surroundcd by green hills and clear water. Though his .birth brought his family great happiness and hope just as any new life, nobody knew that the little boy would get great achievement when he grow up. even start his business oversea, and earn international honor. Let＇s share with you the entrepreneur Ouyang Riping＇s story, which may insights thcsc people who want to succeed and complete oneself in favorite condition or adversity rather leave things to so-called fate.     

Belarus, A Chinese Fort in Europe

＂In recent years, we＇ve found increasing interest from Chinese investors in the Belarus economy. Please let China know, Belarus is always ready to be a true friend to China. We have built a fort in Europe for China,＂ the President of Belarus, Alexander Lukashenko told Zhou Xiaochuan, President of the Bank of China, during his visit to the capital of Minsk, on January 8th, he expressed his high praise and firm confidence in the development of Sino-Belarusian relations.     

What＇s Behind Spring Festival？

Similar to what the Christmas Day means for the westerners,the Spring Festival is the most important celebration for Chinese people.This big event according to Chinese traditional lunar calendar relaxes and pleases the whole country as the happiest gathering time of the year.National-wide crusade for going back home,too-difficult-to-get train tickets,generous family-going-out shopping,Miaohui laundering,New Year Eve reunion dinner,visiting friends and relatives,watching annual TV gala......each piece of clue reminds us of the smell of Chinese Spring Festival.     

KEY WDRDS for Foreign Investment in China

FDI(Foreign Direct Investment),a component of a country's national financlal accounts,is investment of foreign assets into domestic structures,equipment,and organizations.It does not include foreign investment into the stock markets,concession and subcontract.FDI iS thought to be more useful to a country than investments in the equity of its companies because equity investments are potentially "hot money"which can leave at the first sign of trouble,whereas FDI is durable and generally useful whether things go well or badly.     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Consumption, New Protagonist in 2007 GDP

Not long ago, the National Bureau of Statistics released its 2007 Macro Economy Index. Social consumption retail sales reached RMB 8.9 billion, increased by 16.8 percent over the previous year, or 3.1 percentage points higher; the whole investment in social fixed assets was valued RMB 13.7 billion, a year-on-year increase of 24.8 percent, that is 0.9 percentage points higher; and trade surplus amounted to RMB 24.7 billion, rising by 47.7 percent compared with the same period last year, 26.3 percentage points falling over the increasing speed last year. According to preliminary estimates, GDP for the year was RMB 24.67 trillion, up by 11.4 percent from the previous year,