Bayesian procedures
Unlike frequentist procedures, Bayesian classification procedures provide a natural way of taking into account any
available information about the relative sizes of the sub-populations associated with the different groups within the
overall population.[6] Bayesian procedures tend to be computationally expensive and, in the days before Markov
chain Monte Carlo computations were developed, approximations for Bayesian clustering rules were devised.[7]
Some Bayesian procedures involve the calculation of group membership probabilities: these can be viewed as
providing a more informative outcome of a data analysis than a simple attribution of a single group-label to each new
observation