Chi-square automatic interaction detection: Difference between revisions

Revision as of 13:28, 5 January 2019

Revision as of 21:00, 20 February 2021

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'''Chi-square automatic interaction detection''' ('''CHAID''') is a [[Decision tree learning|decision tree]] technique, based on adjusted significance testing ([[Bonferroni testing]]). The technique was developed in South Africa and was published in 1980 by Gordon V. Kass, who had completed a PhD thesis on this topic. CHAID can be used for predictionregression (in a similar fashion to [[regression analysis]], this version of CHAID being originally known as XAID) as well as classification, and for detection of interaction between variables. CHAID is based on a formal extension of the United States' AID (Automatic Interaction Detection) and THAID (THeta Automatic Interaction Detection) procedures of the 1960s and 1970s, which in turn were extensions of earlier research, including that performed in the UK in the 1950s.

In practice, CHAID is often used in the context of [[direct marketing]] to select groups of consumers and predict how their responses to some variables affect other variables, although other early applications were in the field of medical and psychiatric research.