10.6 Binning

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A binning function is provided by Rattle, coded by Daniele Medri. The Rattle interface provides an option to choose between Quantile binning, KMeans binning, and Equal Width binning. For each option the default number of bins is 4, and we can change this to suit our needs. The generated variables are prefixed with either BQU_, BKM_, or BEW_ respectively, with a suffix of n for the number of bins. Thus, we can create multiple binnings for any variable.

An example of why we might want to do this is to visualise data. A mosaic plot, for exapmle, is only uesful for categoric data and so we could turn Sunshine into a categoric by binning. Also talk about binning to show box plot for different targets.

Note that quantile binning is the same as equal count binning.

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