  The R package abn is designed to fit additive Bayesian models to
observational datasets. It contains routines to score Bayesian networks based
on Bayesian or information theoretic formulations of generalized linear models.
It is equipped with exact search and greedy search algorithms to select the
best network. It supports a possible blend of continuous, discrete and count
data and input of prior knowledge at a structural level. The Bayesian
implementation supports random effects to control for one-layer clustering. In
this paper, we give an overview of the methodology and illustrate the package's
functionalities using a veterinary dataset about respiratory diseases in
commercial swine production.
