R/create.ccov.R

Defines functions create.ccov

## File Name: create.ccov.R
## File Version: 1.08


#**** auxiliary function for creating a covariance matrix
create.ccov <- function( cc, data )
{
    ccc <- cc$ccov.table
    I <- max( ccc$item1ID, ccc$item2ID )
    ccov.matrix <- matrix( 0, nrow=I, ncol=I)
    rownames(ccov.matrix) <- colnames(ccov.matrix) <- colnames(data)
    LL <- nrow(ccc)
    for (ll in 1:LL){
        ccov.matrix[ ccc$item1ID[ll], ccc$item2ID[ll] ] <- ccc$ccov[ll]
        ccov.matrix[ ccc$item2ID[ll], ccc$item1ID[ll] ] <-
                        ccov.matrix[ ccc$item1ID[ll], ccc$item2ID[ll] ]
    }
    return(ccov.matrix)
}


.create.ccov <- create.ccov
alexanderrobitzsch/sirt documentation built on March 18, 2024, 1:29 p.m.