S3 Methods for Computing Item Fit

This S3 method computes some selected item fit statistic.

IRT.itemfit(object, ...)

# S3 method for din
IRT.itemfit(object, method="RMSEA", ...)

# S3 method for gdina
IRT.itemfit(object, method="RMSEA", ...)

# S3 method for gdm
IRT.itemfit(object, method="RMSEA", ...)

# S3 method for reglca
IRT.itemfit(object, method="RMSEA", ...)

# S3 method for slca
IRT.itemfit(object, method="RMSEA", ...)

Arguments

object

Object of classes din, gdina, gdm, slca, reglca.

method

Method for computing item fit statistic. Until now, only method="RMSEA" (see itemfit.rmsea) can be used.

...

More arguments to be passed.

Value

Vector or data frame with item fit statistics.

See also

For extracting the individual likelihood or posterior see IRT.likelihood or IRT.posterior.

Examples

if (FALSE) {
#############################################################################
# EXAMPLE 1: DINA model item fit
#############################################################################

data(sim.dina, package="CDM")
data(sim.qmatrix, package="CDM")

# estimate model
mod1 <- CDM::din( sim.dina, q.matrix=sim.qmatrix)
# compute item fit
IRT.itemfit( mod1 )
}