R/IRT.likelihood.R

Defines functions IRT.likelihood.reglca IRT.likelihood.slca IRT.likelihood.gdm IRT.likelihood.mcdina IRT.likelihood.gdina IRT.likelihood.din IRT.likelihood

Documented in IRT.likelihood IRT.likelihood.din IRT.likelihood.gdina IRT.likelihood.gdm IRT.likelihood.mcdina IRT.likelihood.reglca IRT.likelihood.slca

## File Name: IRT.likelihood.R
## File Version: 0.20

###########################################################
# extracts the individual likelihood
IRT.likelihood <- function (object, ...)
{
    UseMethod("IRT.likelihood")
}
###########################################################

#....................................
# How to remove attributes:
# l6 <- IRT.likelihood(mod1)
# attributes(l6) <- NULL
#....................................

###########################################################
# object of class din
IRT.likelihood.din <- function( object, ... )
{
    ll <- object$like
    attr(ll,"theta") <- object$attribute.patt.splitted
    attr(ll,"prob.theta") <- object$attribute.patt$class.prob
    attr(ll,"G") <- 1
    return(ll)
}
###########################################################

###########################################################
# object of class gdina
IRT.likelihood.gdina <- function( object, ... )
{
    ll <- object$like
    attr(ll,"theta") <- object$attribute.patt.splitted
    attr(ll,"prob.theta") <- object$attribute.patt[, 1:object$G ]
    attr(ll,"G") <- object$G
    return(ll)
}
############################################################

###########################################################
# object of class mcdina
IRT.likelihood.mcdina <- function( object, ... )
{
    ll <- object$like
    attr(ll,"theta") <- object$attribute.patt.splitted
    attr(ll,"prob.theta") <- object$attribute.patt
    attr(ll,"G") <- object$G
    return(ll)
}
############################################################

###########################################################
# object of class gdm
IRT.likelihood.gdm <- function( object, ... )
{
    ll <- object$p.xi.aj
    attr(ll,"theta") <- object$theta.k
    attr(ll,"prob.theta") <- object$pi.k
    attr(ll,"G") <- object$G
    return(ll)
}
############################################################

###########################################################
# object of class slca
IRT.likelihood.slca <- function( object, ... )
{
    ll <- object$p.xi.aj
    attr(ll,"theta") <- NA
    res <- list( "delta"=object$delta,
                    "delta.designmatrix"=object$delta.designmatrix )
    attr(ll,"skillspace") <- res
    attr(ll,"prob.theta") <- object$pi.k
    attr(ll,"G") <- object$G
    return(ll)
}
############################################################

###########################################################
# object of class reglca
IRT.likelihood.reglca <- function( object, ... )
{
    ll <- object$p.xi.aj
    attr(ll,"theta") <- NA
    attr(ll,"prob.theta") <- object$class_probs
    attr(ll,"G") <- object$G
    return(ll)
}
############################################################

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CDM documentation built on Nov. 6, 2018, 5:07 p.m.