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Week #32 – CHAID

An essential feature is the use of the chi-square test for contingency tables to decide which variables are of maximal importance for classification. Another aspect of CHAID is its ability to build non-binary classification trees – i.e. trees where more than two branches may go from a node.

CHAID can deal with multi-way contingency tables, when both predictors and response categorical variables have many classes. For this reason CHAID is widely used, for example, for market segmentation studies.