主管:中国科学院
主办:中国优选法统筹法与经济数学研究会
   中国科学院科技战略咨询研究院

中国管理科学 ›› 2011, Vol. 19 ›› Issue (2): 10-15.

• 论文 • 上一篇    下一篇

具有时变自由度的t-copula蒙特卡罗组合收益风险研究

高岳, 王家华, 杨爱军   

  1. 南京审计学院金融学院, 江苏南京 211815
  • 收稿日期:2009-09-03 修回日期:2011-02-28 出版日期:2011-04-30 发布日期:2011-04-30
  • 作者简介:高岳(1982- ),男(汉族),江苏南京人,南京审计学金融学院博士,讲师,研究方向:金融工程、风险管理。
  • 基金资助:

    江苏省教育厅2009年度高校哲学社会科学基金项目(09SJB790024);南京审计学院2010年度高层次引进人才经费资助(NSRC1003);“青蓝工程”项目资助

Estimation on Portfolio Risk via Time-varying T-copula and Monte-carlo Method

GAO Yue, WANG Jia-hua   

  1. School of Finance, Nanjing Audit University, Nanjing 211815, China
  • Received:2009-09-03 Revised:2011-02-28 Online:2011-04-30 Published:2011-04-30

摘要: 应用时变条件t-copula函数描述股票指数收益序列之间的时变相依结构。时变条件t-copula模型的难点在于如何设定时变相依参数的演化方程,本文建立了用于描述包含时变自由度在内的所有时变相依模型参数的演化方程。进而采用蒙特卡洛仿真方法计算了各种指数组合的VaR,分析了道琼斯指数与标准普尔指数组合风险的演化趋势,并对结果进行后验测试,结果表明,时变条件t-copula函数仿真估计VaR可以覆盖最大损失风险。

关键词: 时变, 自由度, Copula, VaR

Abstract: A time-varying t-copula model is used to investigate the dependence between return series of Dow Jones Industrial Average Index and S&P 500INDEX.The difficulty of time-varying t-copula model is how to specify evolution equation of time-varying dependence parameters.A new evolution equation have been established to describe time-varying parameters including time-varying related correlation coefficient and degree of freedom.Moreover,stimulated portfolio return series is generated by monte-carlo method in order to get VaR of different portfolios.Next,a simple analysis on the risk trend of these portfolios is given here.The VaR results are tested by backtesting method,the result of these tests shows that VaR series calculated by time-varying copula model have a good coverage rate to factual lost.

Key words: time-varying, Copula, VaR

中图分类号: