R/gdina_proc_multiple_group_objects.R

In CDM: Cognitive Diagnosis Modeling

## File Name: gdina_proc_multiple_group_objects.R
## File Version: 0.08

gdina_proc_multiple_group_objects <- function(group)
{
    G <- 1
    group0 <- group
    groupre <- FALSE
    group2 <- NULL
    if ( is.factor( group ) ){
        group <- paste( group )
    }
    if ( ! is.null( group) ){
        group0 <- group
        groups <- sort( unique( group) )
        G <- length(groups)
        group2 <- match( group, groups )
        if ( any( group !=group2 ) ){
            group <- group2
            groupre <- TRUE
        }
    }
    group.stat <- NULL
    if ( G > 1 ){
        # group statistics
        a1 <- stats::aggregate( 1+0*group, list(group), sum )
        a2 <- rep("",G)
        for (gg in 1:G){
            a2[gg] <- group0[ which( group==gg )[1]  ]
        }
        group.stat <- cbind( a2, a1 )
        colnames(group.stat) <- c(  "group.orig", "group", "N"  )
    }

    #---- OUTPUT
    res <- list(G=G, group=group, group0=group0, groupre=groupre, group.stat=group.stat,
                    group2=group2)
    return(res)
}