It looks like all references to the mu_b_T_model_estimation_error parameter are commented out in the poll_model_2020.stan model as well as poll_model_2020_no_mode_adjustment.stan. Presumably this variable should be removed from the parameters declaration. I'm not sure if this is the current Stan behavior, but there are at least some cases from past versions where unused parameters can negatively impact model behavior through unintended impacts on the posterior.
elliottmorris
commented
4 years ago
It looks like all references to the
mu_b_T_model_estimation_errorparameter are commented out in thepoll_model_2020.stanmodel as well aspoll_model_2020_no_mode_adjustment.stan. Presumably this variable should be removed from the parameters declaration. I'm not sure if this is the current Stan behavior, but there are at least some cases from past versions where unused parameters can negatively impact model behavior through unintended impacts on the posterior.https://github.com/TheEconomist/us-potus-model/blob/85be55ae7b0bc68cb155a9ca975e155837eb4851/scripts/model/poll_model_2020.stan#L68