Paper Info
Title
Pricing Currency Option Based on the Extension Principle and Defuzzification via Weighting Parameter Identification.
Abstract
We present a fuzzy version of the Garman-Kohlhagen (FG-K) formula for pricing European currency option based on the extension principle. In order to keep consistent with the real market, we assume that the interest rate, the spot exchange rate, and the volatility are fuzzy numbers in the FG-K formula. The conditions of a basic proposition about the fuzzy-valued functions of fuzzy subsets are modified. Based on the modified conditions and the extension principle, we prove that the fuzzy price obtained from the FG-K formula for European currency option is a fuzzy number. To simplify the trade, the weighted possibilistic mean (WPM) value with a weighting function is adopted to defuzzify the fuzzy price to a crisp price. The numerical example shows our method makes the alpha-level set of fuzzy price smaller, which decreases the fuzziness. The example also indicates that the WPM value has different approximation effects to real market price by taking different values of weighting parameter in the weighting function. Inspired by this example, we provide a method, which can identify the optimal parameter.
Year
DOI
Venue
2013
10.1155/2013/623945
JOURNAL OF APPLIED MATHEMATICS
Field
DocType
Volume
Mathematical optimization,Weighting,Defuzzification,Fuzzy logic,Market price,Interest rate,Type-2 fuzzy sets and systems,Fuzzy number,Mathematics,Exchange rate
Journal
2013
Issue
ISSN
Citations 
null
1110-757X
0
PageRank 
References 
Authors
0.34
10
4
Name
Order
Citations
PageRank
Jixiang Xu100.34
Yanhua Tan200.68
Jinggui Gao322.39
Enmin Feng411124.41