How to Quantify Deterministic and Random Influences on the Statistics of the Foreign Exchange Market

Abstract
It is shown that price changes of the U.S. dollar–German mark exchange rates upon different delay times can be regarded as a stochastic Marcovian process. Furthermore, we show how Kramers-Moyal coefficients can be estimated from the empirical data. Finally, we present an explicit Fokker-Planck equation which models very precisely the empirical probability distributions, in particular, their non-Gaussian heavy tails.
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