In addition, there is the obvious requirement that the method should be fast
enough to handle large databases of interest.
We feel that one method of addressing these points is to consider multivariate
discretization as opposed to univariate discretization. In multivariate discretization
one considers how all the variables interact before deciding on discretized
intervals. In contrast, univariate approaches only consider a single variable at a
time (sometimes in conjunction with class information) and does not consider
interactions with other variables.