Nonparametric Bayesian inference for multidimensional compound Poisson processes
Volume 2, Issue 1 (2015), pp. 1–15
Pub. online: 13 March 2015
Type: Research Article
Open Access
Open Access
Received
24 December 2014
24 December 2014
Revised
27 February 2015
27 February 2015
Accepted
1 March 2015
1 March 2015
Published
13 March 2015
13 March 2015
Abstract
Given a sample from a discretely observed multidimensional compound Poisson process, we study the problem of nonparametric estimation of its jump size density $r_{0}$ and intensity $\lambda _{0}$. We take a nonparametric Bayesian approach to the problem and determine posterior contraction rates in this context, which, under some assumptions, we argue to be optimal posterior contraction rates. In particular, our results imply the existence of Bayesian point estimates that converge to the true parameter pair $(r_{0},\lambda _{0})$ at these rates. To the best of our knowledge, construction of nonparametric density estimators for inference in the class of discretely observed multidimensional Lévy processes, and the study of their rates of convergence is a new contribution to the literature.
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