Equivalent of drop_baseline=TRUE for stan_glm?

Interfaces rstanarm
1

In arm, there is an option to not drop baseline factors when creating a design matrix. I am porting an arm::bayesglm model to use rstanarm::stan_glm but can’t get comparable results because arm::stan_glm always drops the baseline factors.

  • Is there an option somewhere to not drop baseline factors when creating the design matrix?
  • Does it not exist because the expectation is that one would use rstanarm::stan_glmer in this situation?

If it does not exist, is there interest in a patch to add it?