Given a variable x with n distinct values, create n new dummy coded variables coded 0/1 for presence (1) or absence (0) of each variable. A typical application would be to create dummy coded college majors from a vector of college majors. By default, NA values of x are returned as NA (added 10/20/17)
A vector to be transformed into dummy codes
If TRUE, return NA for all codes with NA in x
When coding demographic information, it is typical to create one variable with multiple categorical values (e.g., ethnicity, college major, occupation).
dummy.code will convert these categories into n distinct dummy coded variables.
If using dummy coded variables as predictors, remember to use n-1 variables.
A matrix of dummy coded variables
1 2 3
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