CDM: IRT.factor.scores – R documentation

Pricing

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

Get Started for Free

Documentation

CDM

IRT.factor.scores

S3 Methods for Extracting Factor Scores (Person Classifications)

Description

This S3 method extracts factor scores or skill classifications.

Usage

IRT.factor.scores(object, ...)

## S3 method for class 'din'
IRT.factor.scores(object, type="MLE", ...)

## S3 method for class 'gdina'
IRT.factor.scores(object, type="MLE", ...)

## S3 method for class 'mcdina'
IRT.factor.scores(object, type="MLE", ...)

## S3 method for class 'gdm'
IRT.factor.scores(object, type="EAP", ...)

## S3 method for class 'slca'
IRT.factor.scores(object, type="MLE", ...)

Arguments

`object`	Object of classes `din`, `gdina`, `mcdina`, `gdm` or `slca`.
`type`	Type of estimated factor score. This can be `"MLE"`, `"MAP"` or `"EAP"`. The type `EAP` cannot be used for objects of class `slca`.
`...`	More arguments to be passed.

Value

A matrix or a vector with classified scores.

Examples

#############################################################################
# EXAMPLE 1: Extracting factor scores in the DINA model
#############################################################################

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

# estimate DINA model
mod1 <- CDM::din( sim.dina, q.matrix=sim.qmatrix)
summary(mod1)
# MLE
fsc1a <- CDM::IRT.factor.scores(mod1)
# MAP
fsc1b <- CDM::IRT.factor.scores(mod1, type="MAP")
# EAP
fsc1c <- CDM::IRT.factor.scores(mod1, type="EAP")
# compare classification for skill 1
stats::xtabs( ~ fsc1a[,1] + fsc1b[,1] )
graphics::boxplot( fsc1c[,1] ~ fsc1a[,1] )

CDM

Cognitive Diagnosis Modeling

v7.5-15

GPL (>= 2)

Authors

Alexander Robitzsch [aut, cre], Thomas Kiefer [aut], Ann Cathrice George [aut], Ali Uenlue [aut]

Initial release

2020-03-10 14:19:21