Most ANCOVA analyses do not include a term for the interaction between the categorical variable and the numerical one.

Question

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ANCOVA (Analysis of Covariance) typically focuses on adjusting for the effect of a numerical covariate on the relationship between a categorical independent variable and a continuous dependent variable, without necessarily including an interaction term between the categorical and numerical variables. The primary aim is to control for the covariate, not to explore interactions between it and the categorical variable.

Most ANCOVA Analyses Do Not Include a Term for the Interaction