R/gdina_attribute_patterns_reduced_skillspace.R

In alexanderrobitzsch/CDM: Cognitive Diagnosis Modeling

## File Name: gdina_attribute_patterns_reduced_skillspace.R
## File Version: 0.10

gdina_attribute_patterns_reduced_skillspace <- function( attr.patt, K, maxAttr, q.matrix,
        Z.skillspace, G )
{
    A <- attr.patt
    # combinations
    kombis <- utils::combn( K, 2 )
    KK <- ncol(kombis)
    B <- NULL
    for (kk in 1:KK){
        B <- cbind( B, attr.patt[, kombis[1,kk] ] * attr.patt[, kombis[2,kk] ] )
    }
    Z <- cbind( 1, A, B )
    ncolZ <- ncol(Z)
    v1 <- c("Int",  paste("A",1:K, sep="") )
    v1 <- c(v1,apply( kombis, 2, FUN=function(ll){
            paste( paste( "A", ll, sep=""), collapse="_" ) } ))
    colnames(Z) <- v1

    m1 <- which( maxAttr > 1 )
    if ( max(maxAttr) > 1 ){
        Z1 <- Z[, m1, drop=FALSE ]^2
        colnames(Z1) <- paste0( colnames(q.matrix)[m1], "*2")
        Z <- cbind( Z, Z1 )
    }
    if ( ! is.null(Z.skillspace) ){
        Z <- Z.skillspace
    }
    ncolZ <- ncol(Z)
    beta <- rep(0, ncolZ )
    if (G > 1){
        beta <- matrix( beta, nrow=ncolZ, ncol=G)
    }
    #----- OUTPUT
    res <- list(Z=Z, ncolZ=ncolZ, beta=beta )
    return(res)
}