R/mcmc_vcov.R

In sirt: Supplementary Item Response Theory Models

## File Name: mcmc_vcov.R
## File Version: 0.13


#--- variance covariance matrix
mcmc_vcov <- function( mcmcobj, exclude="deviance" )
{
    mcmcobj <- mcmc_extract_samples_first_chain(mcmcobj=mcmcobj)
    mcmcobj <- mcmcobj[, ! ( colnames(mcmcobj) %in% exclude ) ]
    res <- stats::var(mcmcobj)
    colnames(mcmcobj) -> colnames(res) -> rownames(res)
    return(res)
}