R/summary.isop.R

In sirt: Supplementary Item Response Theory Models

## File Name: summary.isop.R
## File Version: 0.13


#*** Summary for isop object
summary.isop <- function( object, ... )
{
    cat("-----------------------------------------------------------------\n")
    d1 <- utils::packageDescription("sirt")
    cat( paste( d1$Package, " ", d1$Version, " (", d1$Date, ")", sep=""), "\n\n" )
    cat( "Date of Analysis:", paste( object$s2 ), "\n" )

    cat("ISOP and ADISOP Model \n")
    cat("-----------------------------------------------------------------\n")
    cat( "Number of persons=", dim(object$dat)[1], "\n" )
    cat( "Number of items=", dim(object$dat)[2], "\n\n" )

    cat( "Number of person score groups=", dim(object$freq.correct)[1], "\n" )
    cat( "Number of item score groups=", dim(object$freq.correct)[2], "\n" )

    cat( "\nLog-Likelihood Comparison\n")
    obji <- object$ll
    obji[,2] <- round( obji[,2], 3 )
    obji[,3] <- round( obji[,3], 5 )
    if ( object$model=="np.dich" ){
        obji$fit <- round( c(NA,object$fit ), 4 )
    }
    print(obji)

    cat("*****************************************************************\n")
    cat("Item Statistics and Scoring\n")
    obji <- object$item
    for (vv in 2:( ncol(obji))){
        obji[,vv] <- round( obji[,vv], 4 )
    }
    print(obji)
}