A study of Greek letters of currency option under uncertainty environments

A study of Greek letters of currency option under uncertainty environments
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不确定环境下希腊字母货币期权研究

DOI:
10.1016/j.mcm.2009.10.041
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发表时间:
2010-03
影响因子:
--
通讯作者:
Zhang, Weiguo
Zhang, Weiguo
中科院分区:
--
文献类型:
--
作者:
Li, Hongyi;Xu, Weidong;Xu, Weijun;Zhang, Weiguo

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由于金融市场的不时波动,Garman-Kohlhagen 模型中的一些输入变量,特别是利率、即期汇率和波动性 [M.B.加曼,S.W. Kohlhagen,外币期权价值,国际货币与金融期刊 2 (1983) 231–237] 不能在精确意义上进行预期。因此,Zadeh [L.A. Zadeh,模糊集,信息和控制 8 (1965) 338–353] 可以提供一个有用的工具来处理这种不精确性。本文基于模糊集合理论提出了三种不同版本的G-K模型、看跌期权平价关系以及根据这三种不同的G-K模型的希腊字母的计算公式。在模糊国内外利率、模糊即期汇率和模糊波动性的考虑下,欧币期权价格和希腊字母变成模糊数字或闭区间。这意味着投资者可以选择任何具有可接受的置信度或置信度权重参数的欧洲货币期权价格和希腊字母供其以后使用。实证结果表明,模糊环境下计算的希腊系数可以被视为期权立权人管理期权风险的有用工具。
Owing to the fluctuations in the financial markets from time to time, some input variables, in particular the interest rate, spot exchange rate and volatility, in the Garman–Kohlhagen model [M.B. Garman, S.W. Kohlhagen, Foreign currency option values, Journal of International Money and Finance 2 (1983) 231–237] cannot be expected in a precise sense. Therefore, the fuzzy set theory introduced by Zadeh [L.A. Zadeh, Fuzzy sets, Information and Control 8 (1965) 338–353] can provide a useful tool to deal with this kind of impreciseness. In this paper, three different versions of the G–K model, the put-call parity relationship and the calculation formulas of the Greek letters according to these three different G–K models are then proposed based on fuzzy set theory. Under the considerations of fuzzy foreign and domestic interest rates, fuzzy spot exchange rate and fuzzy volatility, the European currency option prices and the Greek letters turn into fuzzy numbers or closed intervals. This means that the investors can pick any European currency option price and Greek letters with an acceptable belief degree or belief degree weighting parameter for his later use. The empirical results indicate that the Greeks calculated under fuzzy environment can be considered as a useful tool for managing option risk for an option writer.
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