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equateIRT (version 2.5.1)

IRT Equating Methods

Description

Computation of direct, chain and average (bisector) equating coefficients with standard errors using Item Response Theory (IRT) methods for dichotomous items (Battauz (2013) , Battauz (2015) ). Test scoring can be performed by true score equating and observed score equating methods. DIF detection can be performed using a Wald-type test (Battauz (2019) ). The package includes tests to assess the stability of the equating transformations (Battauz(2022) ).

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Version

Install

install.packages('equateIRT')

Monthly Downloads

595

Version

2.5.1

License

GPL-3

Maintainer

Michela Battauz

Last Published

October 3rd, 2024

Functions in equateIRT (2.5.1)

id.test

Identity Test
sd.test

Test on Chain Equating Coefficients
itm

Extract Item Parameters
linkp

Linkage Plan
score

Scoring
est2pl

Item Parameter Estimates and Covariance Matrices of a Two-Parameter Logistic Model
est3pl

Item Parameter Estimates and Covariance Matrices of a Three-Parameter Logistic Model
modIRT

Estimated Coefficients and Covariance Matrix of IRT Models
estrasch

Item Parameter Estimates and Covariance Matrices of a Rasch Model
import.ltm

Import Item Parameters Estimates and Covariance Matrices from IRT Software
summary.eqclist

Summarizing a List of Estimated Direct Equating Coefficients
summary.ceqc

Summarizing Estimated Chain Equating Coefficients
summary.ceqclist

Summarizing a List of Estimated Chain Equating Coefficients
summary.eqc

Summarizing Estimated Equating Coefficients
summary.meqc

Summarizing Bisector Equating Coefficients
alldirec

Direct Equating Coefficients Between All Pairs of a List of Forms
chainec

Chain Equating Coefficients
convert

Item Parameters Conversion
direc

Direct Equating Coefficients
bisectorec

Bisector Equating Coefficients
eqc

Extract Equating Coefficients
equateIRT-package

IRT Equating Methods
data2pl

Simulated Data Sets
dif.test

DIF Test
dataDIF

Simulated Data Set with DIF