Read CmdStan CSV files as a brms-formatted stanfit object

read_csv_as_stanfit is used internally to read CmdStan CSV files into a stanfit object that is consistent with the structure of the fit slot of a brmsfit object.

read_csv_as_stanfit(
  files,
  variables = NULL,
  sampler_diagnostics = NULL,
  model = NULL,
  exclude = "",
  algorithm = "sampling"
)

Arguments

files: Character vector of CSV files names where draws are stored.
variables: Character vector of variables to extract from the CSV files.
sampler_diagnostics: Character vector of sampler diagnostics to extract.
model: A compiled cmdstanr model object (optional). Provide this argument if you want to allow updating the model without recompilation.
exclude: Character vector of variables to exclude from the stanfit. Only used when variables is also specified.
algorithm: The algorithm with which the model was fitted. See brm for details.

Value

A stanfit object consistent with the structure of the fit

slot of a brmsfit object.

Examples

if (FALSE) {
# fit a model manually via cmdstanr
scode <- stancode(count ~ Trt, data = epilepsy)
sdata <- standata(count ~ Trt, data = epilepsy)
mod <- cmdstanr::cmdstan_model(cmdstanr::write_stan_file(scode))
stanfit <- mod$sample(data = sdata)

# feed the Stan model back into brms
fit <- brm(count ~ Trt, data = epilepsy, empty = TRUE, backend = 'cmdstanr')
fit$fit <- read_csv_as_stanfit(stanfit$output_files(), model = mod)
fit <- rename_pars(fit)
summary(fit)
}