Related question. Is there any way to get brms to use a “centered” parameterization? What I mean is no:
transformed parameters {
// group-level effects
vector[N_1] r_1_1 = sd_1[1] * (z_1[1]);
}
just declaring r_1_1 in parameters and using directly without scaling by sd_1. Stan manual suggests this is more efficient in large data settings.