R/tam_mml_3pl_inits_group.R

In TAM: Test Analysis Modules

## File Name: tam_mml_3pl_inits_group.R
## File Version: 0.06

tam_mml_3pl_inits_group <- function(group, ndim, G, variance.inits, groups)
{
    var.indices <- NULL
    # group indicators for variance matrix
    if ( ! is.null(group) ){
        var.indices <- rep(1,G)
        for (gg in 1:G){
            var.indices[gg] <- which( group==gg )[1]
        }
        if ( is.null( variance.inits ) ){
            variance <- array( 0, dim=c(G,ndim,ndim) )
            for (gg in 1:G){
                variance[gg,,] <- diag(ndim)
            }
        }
    }
    #--- OUTPUT
    res <- list(G=G, groups=groups, group=group, var.indices=var.indices)
    return(res)
}