For basic information about discretization, which is also called binning, see Discretization.
You must specify separate binning strategies for categorical attributes and numerical attributes. For numeric attributes, you can choose one of three different binning strategies: equal width, quantile, or custom. For categorical attributes, you can choose one of two strategies: Top N and none. For both kinds of attributes, the system generates a recommended default strategy appropriate for the algorithm that you intend to use (for example, Naive Bayes).
For information about binning methods, see Binning Methods.
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