R/tam_remove_missings.R

In TAM: Test Analysis Modules

## File Name: tam_remove_missings.R
## File Version: 0.05

tam_remove_missings <- function( dat, items, elim_items=TRUE, elim_persons=TRUE )
{
    cn <- colnames(dat)
    non_items <- setdiff( cn, items )
    resp <- dat[, items]
    if (elim_items){
        resp <- resp[, colMeans( is.na(resp) ) < 1 ]
        items <- colnames(resp)
        vars <- c( non_items, items )
        vars <- intersect( cn, vars )
        dat <- dat[, vars ]
    }
    if (elim_persons){
        ind <- which( rowMeans( is.na(resp) ) < 1 )
        resp <- resp[ ind, ]
        dat <- dat[ ind, ]
    }
    #--- output
    res <- list( resp=resp, dat=dat, items=items )
    return(res)
}