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Backend Portability and Installation

The advanced extension supports the two backends officially exposed by brms: rstan and cmdstanr. The model family, formula, priors, and algorithm remain restricted by gp3bayes. Only the implementation backend is selectable.

Audit installed components

bayesian_backend_capabilities()
#> 
#> Optional Bayesian capabilities
#> 
#>         component installed    version usable
#>              brms      TRUE     2.23.0   TRUE
#>             rstan      TRUE     2.32.7   TRUE
#>          cmdstanr      TRUE      0.9.0   TRUE
#>               loo      TRUE     2.10.0   TRUE
#>        priorsense      TRUE      1.2.0   TRUE
#>  detectseparation      TRUE      0.4.0   TRUE
#>               SBC      TRUE 0.5.0.9000   TRUE
#>                                                          detail
#>                                               package available
#>                                               package available
#>  CmdStan 2.39.0 at C:/Users/Stefanos-PC/.cmdstan/cmdstan-2.39.0
#>                                               package available
#>                                               package available
#>                                               package available
#>                                               package available

CmdStanR setup

Install CmdStanR from the Stan R-universe repository:

install.packages(
  "cmdstanr",
  repos = c(
    "https://stan-dev.r-universe.dev",
    getOption("repos")
  )
)

Then check the C++ toolchain and install CmdStan:

cmdstanr::check_cmdstan_toolchain()
cmdstanr::install_cmdstan(cores = 2)
check_cmdstan_backend(strict = TRUE)

The gp3bayes installer never installs or repairs CmdStan automatically unless that explicit option is enabled.

Full MCMC only

fit <- fit_duration_model_backend(
  specification = duration_spec,
  backend = "cmdstanr",
  chains = 2,
  iter = 2000,
  warmup = 1000,
  seed = 2026
)

Variational inference, Pathfinder, Laplace approximation, arbitrary Stan code, and arbitrary backend arguments remain outside this wrapper.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.