Dynamical Stochastic Processes of Returns in Financial Markets

Details Dynamical Stochastic Processes of Returns in Financial Markets Dynamical Stochastic Processes of Returns in Financial Markets

2005-12-22

arxiv.org/abs/physics/0512216v1

Physics

Physics and Society

5 pages, 9 figures

Scientific paper

We study the evolution of probability distribution functions of returns, from the tick data of the Korean treasury bond (KTB) futures and the S$&$P 500 stock index, which can be described by means of the Fokker-Planck equation. We show that the Fokker-Planck equation and the Langevin equation from the estimated Kramers-Moyal coefficients are estimated directly from the empirical data. By analyzing the statistics of the returns, we present quantitatively the deterministic and random influences on financial time series for both markets, for which we can give a simple physical interpretation. We particularly focus on the diffusion coefficient that may be significantly important for the creation of a portfolio.

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