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CmdStanR is a lightweight interface to Stan for R users (see CmdStanPy for Python).

If you are new to CmdStanR we recommend starting with these vignettes:

• Getting started with CmdStanR

• How does CmdStanR work?

• A clean interface to Stan services so that CmdStanR can keep up with Stan releases.

• R code that doesn't interface directly with C++, only calls compiled executables.

• Modularity: CmdStanR runs Stan's algorithms and lets downstream modules do the analysis.

• Flexible BSD-3 license.

You can install the latest release of the cmdstanr R package with

# we recommend running this in a fresh R session or restarting your current session
install.packages("cmdstanr", repos = c('https://stan-dev.r-universe.dev', getOption("repos")))

This does not install the vignettes, which take a long time to build, but they are always available online at https://mc-stan.org/cmdstanr/articles/.

To instead install the latest development version of the package from GitHub use

# install.packages("remotes")
remotes::install_github("stan-dev/cmdstanr")

If you don't already have CmdStan installed then, in addition to installing the R package, it is also necessary to install CmdStan using CmdStanR's install_cmdstan() function. A suitable C++ toolchain is also required. Instructions are provided in the Getting started with CmdStanR vignette.

There is a lot of work still to be done, and we welcome contributions from anyone! If you are interested in contributing, please comment on an open issue or open a new one on GitHub. For more details, please check CONTRIBUTING.md.

CmdStanR, like CmdStan and the core Stan C++ code, is licensed under the following licenses:

• Code: BSD 3-clause (https://opensource.org/license/bsd-3-clause/)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)