IRT.irfprob.Rd
This S3 method extracts item response functions evaluated
at a grid of abilities (skills). Item response functions can
be plotted using the IRT.irfprobPlot
function.
IRT.irfprob(object, ...) # S3 method for din IRT.irfprob(object, ...) # S3 method for gdina IRT.irfprob(object, ...) # S3 method for gdm IRT.irfprob(object, ...) # S3 method for mcdina IRT.irfprob(object, ...) # S3 method for reglca IRT.irfprob(object, ...) # S3 method for slca IRT.irfprob(object, ...)
object | |
---|---|
... | More arguments to be passed. |
An array with item response probabilities (items \(\times\) categories \(\times\) skill classes [\(\times\) group]) and attributes
Uni- or multidimensional skill space (theta grid in item response models).
Probability distribution of theta
Design matrix and estimated parameters for
skill space distribution (only for IRT.posterior.slca
)
Number of groups
Plot functions for item response curves: IRT.irfprobPlot
.
For extracting the individual likelihood or posterior see
IRT.likelihood
or IRT.posterior
.
if (FALSE) { ############################################################################# # EXAMPLE 1: Extracting item response functions mcdina model ############################################################################# data(data.cdm02, package="CDM") dat <- data.cdm02$data q.matrix <- data.cdm02$q.matrix #-- estimate model mod1 <- CDM::mcdina( dat, q.matrix=q.matrix) #-- extract item response functions prmod1 <- CDM::IRT.irfprob(mod1) str(prmod1) }