統計数学セミナー

過去の記録 ~08/06次回の予定今後の予定 08/07~

担当者 吉田朋広、荻原哲平、小池祐太
セミナーURL http://www.sigmath.es.osaka-u.ac.jp/~kamatani/statseminar/
目的 確率統計学およびその関連領域に関する研究発表, 研究紹介を行う.

2008年02月06日(水)

16:20-17:30   数理科学研究科棟(駒場) 056号室
竹原 浩太 氏 (東京大学大学院経済学研究科)
A Hybrid Asymptotic Expansion Scheme: an Application to Long-term Currency Options
[ 講演概要 ]
In this session we develop a general approximation scheme, henceforth called a hybrid asymptotic expansion scheme for the valuation of multi-factor European path-independent derivatives. Specifically, we apply it to pricing long-term currency options under a market model of interest rates and a general diffusion stochastic volatility model with jumps of spot exchange rates.

Our scheme is very effective for a type of models in which there exist correlations among all the factors whose dynamics are not necessarily affine nor even Markovian so long as the randomness is generated by Brownian motions. It can also handle models that include jump components under an assumption of their independence of the other random variables when the characteristic functions for the jump parts can be analytically obtained.

Moreover, the hybrid scheme develops Fourier transform method with an asymptotic expansion to utilize closed-form characteristic functions obtainable in parts of a model.

Our scheme also introduces a characteristic-function-based Monte Carlo simulation method with the asymptotic expansion as a control variable in order to make full use of analytical approximations by the asymptotic expansion and of closed-form characteristic functions.

Finally, a series of numerical examples shows the validity of our scheme.

(This is a collaborative research with Professor Akihiko Takahashi(Graduate School of Economics, The University of Tokyo).)
[ 参考URL ]
https://www.ms.u-tokyo.ac.jp/~kengok/statseminar/2007/19.html