where P(e) is a normalization constant [33].
To match a tourist's preferred activities to the provided
activities, the activity choice of other tourists is used as the
prior probability. The choice of those tourists with similar
activity preferences to the tourist is then used as the likelihood
to estimate the posterior probability for the tourist. The results
are the probability of each type of provided activities that the
tourist may choose. This process matches the values between
preferred and provided activities, as illustrated in an example
in a later section (Section VI).