
1
The Discrete Case: Multinomial Bayesian
Networks
In this chapter we will introduce the fundamental ideas behind Bayesian net-
works (BNs) and their basic interpretation, using a hypothetical survey on
the usage of different means of transport. We will focus on modelling discrete
data, leaving continuous data to Chapter 2 and more complex data types to
Chapter 3.
1.1 Introductory Example: Train Use Survey
Consider a simple, hypothetical survey whose aim is to investigate the usage
patterns of different means of transport, with a focus on cars and trains. Such
surveys are used to assess customer satisfaction across different social groups,
to evaluate public ...