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Calculus and “Digitalization” in Finance: Change of Time Method and Stochastic Taylor Expansion with Computation of Expectation

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Modeling, Dynamics, Optimization and Bioeconomics I

Part of the book series: Springer Proceedings in Mathematics & Statistics ((PROMS,volume 73))

Abstract

In this chapter, we give a review and new interpretations on the solution of stochastic differential equation by using the change of time method and the numerical solution with stochastic Taylor expansion. Firstly, a random time change is analyzed. Time change is one of the standard tools for building financial models. The process can be done by a subordinator or an absolutely continuous time change (CTM). The main results of CTM are covered in this chapter. It is applied on one of the important financial problems: Heston model, and to variance and volatility swap as well. In the second part, we focus on numerical simulation of stochastic differential equations arising from the stochastic Taylor series expansion. In order to get more accurate discrete schemes, more terms are added to the Taylor expansion. Application of Itô formula iteratively gives rise to multiple Itô integrals. As for the order of the numerical scheme, the expectations of the product of multiple Itô integrals are to be computed. We discuss the formula for the expectations of the products of Itô integrals. Throughout the chapter, we pay extra attention to the interplay between states and time, and to a “digitalization” of algebraic operations.

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Acknowledgements

The authors of this chapter would like to express their gratitude to the editors of that book, Prof. Dr. D. Zilberman, Prof. Dr. A. Pinto, for giving them the opportunity to introduce their representations and reflections to the readers.

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Correspondence to Fikriye Yılmaz .

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Yılmaz, F., Öz, H., Weber, GW. (2014). Calculus and “Digitalization” in Finance: Change of Time Method and Stochastic Taylor Expansion with Computation of Expectation. In: Pinto, A., Zilberman, D. (eds) Modeling, Dynamics, Optimization and Bioeconomics I. Springer Proceedings in Mathematics & Statistics, vol 73. Springer, Cham. https://doi.org/10.1007/978-3-319-04849-9_42

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