Approximating Probability Densities by Iterated Laplace Approximations

Details Approximating Probability Densities by Iterated Laplace Approximations Approximating Probability Densities by Iterated Laplace Approximations

2011-03-17

arxiv.org/abs/1103.3508v1

Statistics

Computation

to appear in Journal of Computational and Graphical Statistics, http://pubs.amstat.org/loi/jcgs

Scientific paper

The Laplace approximation is an old, but frequently used method to approximate integrals for Bayesian calculations. In this paper we develop an extension of the Laplace approximation, by applying it iteratively to the residual, i.e., the difference between the current approximation and the true function. The final approximation is thus a linear combination of multivariate normal densities, where the coefficients are chosen to achieve a good fit to the target distribution. We illustrate on real and artificial examples that the proposed procedure is a computationally efficient alternative to current approaches for approximation of multivariate probability densities. The R-package iterLap implementing the methods described in this article is available from the CRAN servers.

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