R/tam_mml_inits_groups.R

In alexanderrobitzsch/TAM: Test Analysis Modules

## File Name: tam_mml_inits_groups.R
## File Version: 0.07

tam_mml_inits_groups <- function( group )
{
    var.indices <- NULL
    # group indicators for variance matrix
    if ( ! is.null(group) ){
        groups <- sort(unique(group))
        G <- length(groups)
        group <- match( group, groups )
        var.indices <- rep(1,G)
        for (gg in 1:G){
            var.indices[gg] <- which( group==gg )[1]
        }
    } else {
        G <- 1
        groups <- NULL
    }
    #--- OUTPUT
    res <- list(G=G, groups=groups, group=group, var.indices=var.indices)
    return(res)
}