R/xxirt_vcov.R

In sirt: Supplementary Item Response Theory Models

Defines functions vcov.xxirt

Documented in vcov.xxirt

## File Name: xxirt_vcov.R
## File Version: 0.09

vcov.xxirt <- function( object, ...)
{
    res <- xxirt_hessian( object )
    return( solve(-res) )
}

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