Getting ready

The underlying principle of a Bayesian classifier is that some individuals belong to a class of interest with a given probability based on some observations. This probability is based on the assumption that the characteristics observed can be either dependent or independent from one another; in this second case, the Bayesian classifier is called Naive because it assumes that the presence or absence of a particular characteristic in a given class of interest is not related to the presence or absence of other characteristics, greatly simplifying the calculation. Let's go ahead and build a Naive Bayes classifier.