R/tam_pv_sampling_theta.R

In TAM: Test Analysis Modules

## File Name: tam_pv_sampling_theta.R
## File Version: 0.12

tam_pv_sampling_theta <- function( theta.model, ndim, normal.approx, tamobj, MEAP,
        SDEAP, np.adj, theta, ntheta, mu1, Sigma1, na.grid=5 )
{
    if ( ! theta.model ){
        # 1-dimensional PV imputation
        if (ndim==1){
            # unidimensional theta simulation
            if ( ! normal.approx){
                theta <- matrix( stats::rnorm( ntheta, mean=MEAP, sd=np.adj*SDEAP ), ncol=1)
                theta <- theta[ order( theta[,1] ),, drop=FALSE]
            } else {
                theta <- matrix( SDEAP * seq( - na.grid, na.grid, len=ntheta ) + MEAP, ncol=1 )
            }
        }
        #*****************************
        # multidimensional PV imputation
        if( ndim > 1 ){
            if ( ! normal.approx){
                theta <- CDM::CDM_rmvnorm( ntheta, mean=mu1, sigma=Sigma1 )
            } else {
                theta <- tamobj$theta
            }
        }
    }
    if ( theta.model ){
        theta <- tamobj$theta
    }
    #--- OUTPUT
    res <- list(theta=theta)
    return(res)
}