# sbcrs R package

This package provides tools to simplify the implementation of simulation based calibration using rank statistics (Talts, Betancourt, Simpson, Vehtari, and Gelman, arXiv:1804.06788). It implements a very similar validation procedure to that in rstan::sbc but using a different workflow. In rstan::sbc, the Stan model must be modified by the user to generate rank statistics during sampling. In this package, the Stan model is left unmodified, and the code needed to calculate the rank statistics is written in R. This provides a potentially faster development workflow (Stan recompiles are not needed). It also allows SBC to be used in cases where generating parameters from their prior distributions, or the modeled data from the likelihood function, would be too complicated if written in Stan.