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中文摘要：
引入VaR（Value at Risk）的极值理论对世界原油现货市场的价格风险进行研究.在对WTI和Brent原油现货市场的实证研究中将极值理论的阈值模型与簇值方法相结合,对阈值u和模型参数的估计方法提出了改进,取得了较为理想的VaR估计结果.在此基础上讨论了两市场价格风险的不同特征以及同一市场中厂商风险和采购风险的不同特征.得到了一些有意义的结论.
英文摘要：
This paper introduces the extreme value theory （EVT） of VaR into the research on the price risk of international crude oil spot markets. To get the empirical results, the POT （peaks over threshold） model of EVT is used to study the spot price data of WTI and Brent. As some improvement, this paper introduces partial regression coefficient, clustering and runs test into the POT model. Based on the empirical results, the difference between two spot markets is discussed. Furthermore, the difference between downside risk and upside risk in each spot market is also discussed.
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