I am playing with some options to plot posterior samples — what I think of as coefficient plots. I can get densities with
ggridges::geom_density_ridges(), but I have found other resources such as
coefplot. The problem with the last two is I get the error.
Error: No group-level effects detected. Call method ‘fixef’ to access population-level effects.
I have two questions:
What is the reason for the above error?
What are some other popular ways to plot coefficients?