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Bayesian inference for diffusion processes: Using higher-order approximations for transition densities.

R. Soc. Open Sci. 7:200270 (2020)
Verlagsversion DOI
Open Access Gold
Creative Commons Lizenzvertrag
Modelling random dynamical systems in continuous time, diffusion processes are a powerful tool in many areas of science. Model parameters can be estimated from time-discretely observed processes using Markov chain Monte Carlo (MCMC) methods that introduce auxiliary data. These methods typically approximate the transition densities of the process numerically, both for calculating the posterior densities and proposing auxiliary data. Here, the Euler-Maruyama scheme is the standard approximation technique. However, the MCMC method is computationally expensive. Using higher-order approximations may accelerate it, but the specific implementation and benefit remain unclear. Hence, we investigate the utilization and usefulness of higher-order approximations in the example of the Milstein scheme. Our study demonstrates that the MCMC methods based on the Milstein approximation yield good estimation results. However, they are computationally more expensive and can be applied to multidimensional processes only with impractical restrictions. Moreover, the combination of the Milstein approximation and the well-known modified bridge proposal introduces additional numerical challenges.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Bayesian Data Imputation ; Markov Chain Monte Carlo ; Milstein Scheme ; Parameter Estimation ; Stochastic Differential Equations
ISSN (print) / ISBN 2054-5703
e-ISSN 2054-5703
Quellenangaben Band: 7, Heft: 10, Seiten: , Artikelnummer: 200270 Supplement: ,
Verlag Royal Society of London
Begutachtungsstatus
Förderungen Bundesministerium für Bildung und Forschung
Deutsche Forschungsgemeinschaft