Chi-square automatic interaction detection: Difference between revisions

Revision as of 15:01, 22 September 2009

Revision as of 15:02, 22 September 2009

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'''CHAID''' is a type of [[decision tree]] technique, based upon adjusted significance testing ([[Bonferroni testing]]). The technique was developed in [[South Africa]] and was published in 1980 by Gordon V. Kass. It can be used for prediction (like [[regression analysis]], originally known as XAID) or for detection of interaction between variables. CHAID stands for '''CH'''i-squared '''A'''utomatic '''I'''nteraction '''D'''etector, based upon a formal extension of the US AID (Automatic Interaction Detector) and THAID (THeta Automatic Interaction Detector) procedures of the 1960's and 70's.

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 early applications were in the field of medical and psychiatric research.