![]() ![]() The articles in question are: "Dichotomous Predictors in Linear Regression", "Polytomous Predictors in Linear Regression", "Interactions among Dichotomous Predictors in Regression", "Continuous by Categorical Interactions in Regression", and "Further Interactions with Categorical Variables in Regression". This process is explained in a set of articles on the following ftp site:Ĭlick the Articles link aand then click the links for catreg1.htm to catreg5.htm to download each of the articles. To include a k-level categorical predictor in the Regression procedure, you need to create a set of k-1 contrast variables and enter those in the model place of the categorical variable.
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