CDM (version 8.2-6)

coef: Extract Estimated Item Parameters and Skill Class Distribution Parameters

Description

Extracts the estimated parameters from either din, gdina, gdina or gdm objects.

Usage

# S3 method for din
coef(object, ...)
# S3 method for gdina
coef(object, ...)
# S3 method for mcdina
coef(object, ...)
# S3 method for gdm
coef(object, ...)
# S3 method for slca
coef(object, ...)

Value

A vector, a matrix or a data frame of the estimated parameters for the fitted model.

Arguments

object

An object inheriting from either class din, class gdina, class mcdina, class slca or class gdm.

...

Additional arguments to be passed.

See Also

din, gdina, gdm, mcdina, slca

Examples

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

# DINA model
d1 <- CDM::din( sim.dina, q.matrix=sim.qmatrix)
coef(d1)

if (FALSE) {
# GDINA model
d2 <- CDM::gdina( sim.dina, q.matrix=sim.qmatrix)
coef(d2)

# GDM model
theta.k <- seq(-4,4,len=11)
d3 <- CDM::gdm( sim.dina, irtmodel="2PL", theta.k=theta.k,
            Qmatrix=as.matrix(sim.qmatrix),  centered.latent=TRUE)
coef(d3)
}