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Extract posterior samples from fitted objects

Source: R/bayesian.R
extract_samples.Rd

Helper function to extract posterior samples from common Bayesian modeling packages.

Usage

extract_samples(fit, pars = NULL)

Arguments

fit

A fitted model object from rstan, brms, rstanarm, or similar

pars

Optional character vector of parameter names to extract

Value

A matrix of posterior samples (rows = samples, columns = parameters)

Details

This function provides a unified interface for extracting posterior samples from various Bayesian modeling packages. Currently supports:

  • stanfit objects (rstan)

  • brmsfit objects (brms)

  • stanreg objects (rstanarm)

  • matrix/data.frame (returned as-is)

Examples

# With a matrix of samples (manual specification)
samples <- matrix(rnorm(200), ncol = 2)
colnames(samples) <- c("mu", "sigma")
extracted <- extract_samples(samples)