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中国管理科学 ›› 2017, Vol. 25 ›› Issue (2): 10-20.doi: 10.16381/j.cnki.issn1003-207x.2017.02.002

• 论文 • 上一篇    下一篇

基于高维动态藤Copula的汇率组合风险分析

韩超, 严太华   

  1. 重庆大学经济与工商管理学院, 重庆 400044
  • 收稿日期:2015-11-09 修回日期:2016-10-05 出版日期:2017-02-20 发布日期:2017-05-03
  • 通讯作者: 严太华(1964-),男(汉族),重庆璧山人,重庆大学经济管理学院,博士生导师,教授,研究方向:金融工程,E-mail:875071743@qq.com. E-mail:875071743@qq.com
  • 基金资助:

    国家自然科学基金资助项目(71373296)

Risk analysis of Foreign Exchange Portfolios Based on High-dimensional Dynamic Vine Copula

HAN Chao, YAN Tai-hua   

  1. School of Economics and Business Administration, Chongqing University, Chongqing 400044, China
  • Received:2015-11-09 Revised:2016-10-05 Online:2017-02-20 Published:2017-05-03

摘要: 以Pair Copula为简单构造模块的高维动态藤Copula结构能够克服二元Copula面临的“维度诅咒”问题,对多元变量之间的非线性相依进行动态化描述,是Copula函数研究的学术前沿。本文选取美元、欧元、日元、港币及英镑五种汇率的日间对数收益率数据实证研究,对其进行AR-GJR-GARCH模型过滤,过滤所得新息序列用GPD模型拟合,之后进行概率积分变换,采用高维动态C藤和D藤Copula对变换后序列建模,运用蒙特卡罗方法计算组合风险VaR,对其进行UC回溯测试,并与相应的静态方法作比较。结果表明:高维动态C藤Copula结构计算出来的VaR表现最好,对其进行分解发现美元的边际风险最低,通过蒙特卡罗选择权重组合发现最大限度持有美元将会产生最小VaR。该结论为量化风险指标、合理配置资产,及风险监管提供了一种新的模型与方法。

关键词: AR-GJR-GARCH模型, 高维动态藤Copula, 汇率组合风险, VaR, UC回溯测试

Abstract: The structure of high-dimensional dynamic vine copula can overcome ‘dimensional curse’ faced by bivariate Copula and dynamically describe nonlinear dependence between multi-variables, and represents the academic frontier. Five kinds of foreign exchange log-returns, including USD, EUR, JPY, HKD and GBP, are selected to make empirical analysis, Time series are fitted with AR-GJR-GARCH and GPD models. After probability integral transform, high-dimensional dynamic C and D vine copulas are modelled. Then, portfolio VaR sets are got by Monte-Carlo method, tested by UC back testing, and compared to the corresponding static research. The results show that VaR based on high-dimensional dynamic C vine copula performs the best, and marginal risk of USD is considered as the least by VaR decomposition, the more USD the lest risk. The conclusions provide a new model and method to quantify risk, reasonably allocate asset portfolio, and for authorities to regulate risk.

Key words: AR-GJR-GARCH model, high-dimensional dynamic vine copula, portfolio risk of foreign exchange, VaR, UC back testing

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