Example 8.6: Changing the reference category for categorical variables

September 21, 2010

(This article was first published on SAS and R, and kindly contributed to R-bloggers)

How can we change the reference category for a categorical variable? This question comes up often in a consulting practice.When including categorical covariates in regression models, there is a question of how to incorporate the categories. One simple method is to generate indicator variables, sometimes called dummy variables. We go into some detail about the parameterization of categorical

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