A predictor variable in a logistic regression equation was a birthweight category variable (very low birthweight [1], low birthweight [2], and normal birthweight [3]). With standard (default) contrast coding, how many new variables would be created and what would the codes for normal birthweight be on those variables?

Question

Quizplus · Accepted Answer

In standard (default) contrast coding for a categorical variable with three levels, two new variables are created. The baseline category (here, normal birthweight) is coded as 0 on both of these variables.

A Predictor Variable in a Logistic Regression Equation Was a Birthweight