brms (version 2.18.0)

diagnostic-quantities: Extract Diagnostic Quantities of brms Models

Description

Extract quantities that can be used to diagnose sampling behavior of the algorithms applied by Stan at the back-end of brms.

Usage

# S3 method for brmsfit
log_posterior(object, ...)
# S3 method for brmsfit
nuts_params(object, pars = NULL, ...)
# S3 method for brmsfit
rhat(object, pars = NULL, ...)
# S3 method for brmsfit
neff_ratio(object, pars = NULL, ...)

Value

The exact form of the output depends on the method.

Arguments

object

A brmsfit object.

...

Arguments passed to individual methods.

pars

An optional character vector of parameter names. For nuts_params these will be NUTS sampler parameter names rather than model parameters. If pars is omitted all parameters are included.

Details

For more details see bayesplot-extractors.

Examples

if (FALSE) {
fit <- brm(time ~ age * sex, data = kidney)

lp <- log_posterior(fit)
head(lp)

np <- nuts_params(fit)
str(np)
# extract the number of divergence transitions
sum(subset(np, Parameter == "divergent__")$Value)

head(rhat(fit))
head(neff_ratio(fit))
}