Coeff plots for brms

Interfaces brms
1

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 brmstools::forest and 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:

  1. What is the reason for the above error?

  2. What are some other popular ways to plot coefficients?

2

The latter two are using the coef() method of brms which expects varying (“random”) effects to be present, because that’s what these functions are made for.

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3

What libraries would you use for models with only fixed effects?

4

The bayesplot package has quite a few options. See ?"MCMC-overview" after loading bayesplot. You can also access its functionality directly with brmsfit object via the stanplot method

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