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## File Name: IRT.irfprob.mirt.R
## File Version: 0.27
#--- irfprob singleGroup
IRT.irfprob.mirt.singleGroup <- function( object, ... )
{
object <- mirt.wrapper.posterior(mirt.obj=object)
ll <- object$probs
attr(ll,"theta") <- object$theta.k
attr(ll,"prob.theta") <- object$pi.k
attr(ll,"G") <- 1
return(ll)
}
IRT.irfprob.ConfirmatoryClass <- IRT.irfprob.mirt.singleGroup
IRT.irfprob.ExploratoryClass <- IRT.irfprob.mirt.singleGroup
IRT.irfprob.SingleGroupClass <- IRT.irfprob.mirt.singleGroup
#--- irfprob multipleGroup
#--- by default, only item response functions from the first group are extracted
IRT.irfprob.mirt.multipleGroup <- function( object, group=1, ... )
{
mobj <- object
groups <- object@Data$groupNames
G <- length(groups)
prob.theta <- list()
for (gg in 1:G){
object <- mirt.wrapper.posterior(mirt.obj=mobj, group=groups[gg])
if (gg==group){
ll <- object$probs
theta <- object$theta.k
TP <- object$TP
}
prob.theta[[gg]] <- object$pi.k
}
prob.theta <- matrix( unlist(prob.theta), nrow=TP, ncol=G)
attr(ll,"theta") <- theta
attr(ll,"prob.theta") <- prob.theta
attr(ll,"G") <- G
return(ll)
}
IRT.irfprob.MultipleGroupClass <- IRT.irfprob.mirt.multipleGroup
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