Chi-square automatic interaction detection: Difference between revisions

Revision as of 20:58, 10 April 2007

Revision as of 11:18, 2 May 2007

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'''CHAID''' is a type of [[decision tree]] technique. It was published in [[1980]] by Gordon V. Kass. It can be used for prediction (like [[regression analysis]]) or for detection of interaction between variables. CHAID stands for '''CH'''i-squared '''A'''utomatic '''I'''nteraction '''D'''etector.

'''CHAID''' is a technique that detects interaction between variables. It is used to identify discrete groups of consumer and predict how their responses to some variables affect other variables.

'''CHAID'''In ispractice, ait techniqueis thatoften detectsused interactionin betweenthe variables.context Itof is[[direct usedmarketing]] to identify discreteselect groups of consumerconsumers and predict how their responses to some variables affect other variables.

CHAID stands for ''CHi-squared Automatic Interaction Detector'':

*'''CH'''i-squared

*'''A'''utomatic

*'''I'''nteraction

*'''D'''etector

ItsLike other decision trees, its advantages are that its output is highly visual and containseasy noto equationsinterpret. Because (Itit commonlyuses takesmultiway splits by default, it needs rather large sample sizes to work effectively as with small sample sizes the formrespondent groups can quickly become too ofsmall anfor organisationreliable chartanalysis.)

But it needs large sample sizes to work effectively. CHAID does not work well with small sample sizes as respondent groups can quickly become too small for reliable analysis.

CHAID detects interaction between variables in the data set. Using this technique we can establish relationships between a ‘dependent variable’ – for example readership of a certain newspaper – and other explanatory variables such as price, size, supplements etc. CHAID does this by identifying discrete groups of respondents and, by taking their responses to explanatory variables, seeks to predict what the impact will be on the dependent variable.

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=See also:=

*[[Chi-square distribution]]

*[[Decision tree]]

*[[Latent class model]]

*[[Structural equation modeling]]

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[[Category:Statistical algorithms]]

[[Category:Regression analysis]]

*[[Category:Decision treetheory]]

[[Category:Classification algorithms]]

[[de:CHAID]]