I’ve noticed that the SurveyEngine modeller reports estimates for all levels of dummy coded categorical variables. I am used to needing to omit a level when including categorical variables so as to avoid the “dummy variable trap”. What kind of model specification is being used by the SurveyEngine here?
I can reproduce the same log-likelihood values reported by the SurveyEngine models in other software (e.g., Apollo in R), but I cannot do so without setting a reference category for my dummy variables. Any advice or explanations offered will be greatly appreciated!