我国中小板和创业板市场的投资风险度量研究
首发时间:2017-05-16
摘要:本文以深交所中小板和创业板市场为研究对象,运用GARCH模型刻画收益率波动过程。研究发现波动率序列不符合正态分布假设,而且数据选择的区间股价波动较大,因此本文考虑使用极值模型进行建模,得出极值模型对波动率的刻画要优于传统的正态模型。随后使用多种Copula函数对资产变量进行拟合,并利用蒙特卡罗模拟法对比了不同Copula函数度量VaR的准确性,发现在高置信水平下t、Clayton和混合Copula对VaR测度较为准确,最后使用Copula函数预测了下一期的VaR大小,从而对资产的风险管理提供了较为科学的依据。
关键词: 数量经济学 GARCH模型 极值理论 Copula理论 中小板和创业板
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A Study of Risk Measuring for Investment Based on China's SME Market and GE Market
Abstract:This paper focuses on China's stock market, sampling SME Market index and GE Market index of Shenzhen Stock Exchange, using GARCH models to describe volatility clustering and EVT to describe tail risks of stock markets. EVT model is superior to the tranditional model in volatility fitting. This paper applies different Copula models to analyse VaR of the portfolio by using MC simulation method. The result of the backtesing show that in a high confidence level, t, Clayton and the mixed Copula is much accurate in measuring VaR. Finally, this paper uses Copula method to predict the portfolio's VaR in the next day to provide a reasonable number for risk management.
Keywords: econometrics GARCH model EVT Copula theory SME Market and GE Market
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