tab_model and plot_model unable to access rstan models

[JCruk]

I have run into some difficulty using tab_model and plot_model with rstan models. Both functions throw a transform error and a warning about not being able to access model information.

I have not been able to find a worked example, but it does seem rstan models are supported according to this post.

Perhaps I need to modify the syntax of how I'm calling the strengejacke functions on rstan fits?

A reprex:

# List of needed packages
Pkgs <- c("rstan", "strengejacke")

# Load packages
lapply(Pkgs, require, c = T)

fit <- stan(
  model_code =  "// 8 Schools Example (r)Stan Model
data {
  int<lower=0> J;          // number of schools
  real y[J];               // estimated treatment effects
  real<lower=0> sigma[J];  // s.e. of effect estimates
}
parameters {
  real mu;
  real<lower=0> tau;
  vector[J] eta;
}
transformed parameters {
  vector[J] theta;
  theta = mu + tau * eta;
}
model {
  target += normal_lpdf(eta | 0, 1);
  target += normal_lpdf(y | theta, sigma);
}
  ",
data = list(
  J = 8,
  y = c(28,  8, -3,  7, -1,  1, 18, 12),
  sigma = c(15, 10, 16, 11,  9, 11, 10, 18)
),
chains = 1,
warmup = 500,
iter = 1000,
cores = 1,
refresh = 0
)

Error calling tab_model

tab_model(fit)
Error in if (fam.info$is_linear) transform <- NULL else transform <- "exp" : 
  argument is of length zero
In addition: Warning message:
Could not access model information.

Error calling plot_model

plot_model(fit)
Error in if (fam.info$is_linear) transform <- NULL else transform <- "exp" : 
  argument is of length zero
In addition: Warning message:
Could not access model information. 

[strengejacke]

Sorry, that post was probably a bit imprecise. Actually, you can use models from packages like brms or rstanarm, which rely on rstan. Stan models fitted from package rstan won't work.