coef function

Extract Estimated Item Parameters and Skill Class Distribution Parameters

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

## S3 method for class 'din'
coef(object, ...)

## S3 method for class 'gdina'
coef(object, ...)

## S3 method for class 'mcdina'
coef(object, ...)

## S3 method for class 'gdm'
coef(object, ...)

## S3 method for class 'slca'
coef(object, ...)

Arguments

• object: An object inheriting from either class din, class gdina, class mcdina, class slca

  or class gdm.

• ...: Additional arguments to be passed.

Returns

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

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)

## Not run:

# 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)
## End(Not run)