On infinite-dimensional hierarchical probability models in statistical inverse problems

Details On infinite-dimensional hierarchical probability models in statistical inverse problems On infinite-dimensional hierarchical probability models in statistical inverse problems

2009-07-30

arxiv.org/abs/0907.5322v2

Mathematics

Statistics Theory

28 pages, 14 figures

Scientific paper

In this article, the solution of a statistical inverse problem $M = AU+\mathcal{E}$ by the Bayesian approach is studied where $U$ is a function on the unit circle $\mathbb{T}$, i.e., a periodic signal. The mapping $A$ is a smoothing linear operator and $\mathcal{E}$ a Gaussian noise. The connection to the solution of a finite-dimensional computational model $M_{kn} = A_k U_n + \mathcal{E}_k$ is discussed. Furthermore, a novel hierarchical prior model for obtaining edge-preserving conditional mean estimates is introduced. The convergence of the method with respect to finer discretization is studied and the posterior distribution is shown to converge weakly. Finally, theoretical findings are illustrated by a numerical example with simulated data.

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