extract_draws function

Extract draws from a stanfit object

Extract draws from a stanfit object and convert them into lists.

The function rstan::extract() returns the draws for a given parameter as an array. This function calls rstan::extract() to extract the draws from a stanfit object and then convert the arrays into lists.

extract_draws(stan_fit, n_samples)

Arguments

• stan_fit: A stanfit object.
• n_samples: Number of MCMC draws.

Returns

A named list of length 2 containing:

• beta: a list of length equal to n_samples containing the draws from the posterior distribution of the regression coefficients.
• sigma: a list of length equal to n_samples containing the draws from the posterior distribution of the covariance matrices. Each element of the list is a list with length equal to 1 if same_cov = TRUE or equal to the number of groups if same_cov = FALSE.