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equateIRT (version 2.5.2)

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

671

Version

2.5.2

License

GPL-3

Maintainer

Michela Battauz

Last Published

April 30th, 2025

Functions in equateIRT (2.5.2)

est2pl

Item Parameter Estimates and Covariance Matrices of a Two-Parameter Logistic Model
id.test

Identity Test
import.ltm

Import Item Parameters Estimates and Covariance Matrices from IRT Software
modIRT

Estimated Coefficients and Covariance Matrix of IRT Models
score

Scoring
itm

Extract Item Parameters
linkp

Linkage Plan
estrasch

Item Parameter Estimates and Covariance Matrices of a Rasch Model
summary.eqc

Summarizing Estimated Equating Coefficients
est3pl

Item Parameter Estimates and Covariance Matrices of a Three-Parameter Logistic Model
sd.test

Test on Chain Equating Coefficients
summary.eqclist

Summarizing a List of Estimated Direct Equating Coefficients
summary.ceqclist

Summarizing a List of Estimated Chain Equating Coefficients
summary.meqc

Summarizing Bisector Equating Coefficients
summary.ceqc

Summarizing Estimated Chain Equating Coefficients
alldirec

Direct Equating Coefficients Between All Pairs of a List of Forms
dif.test

DIF Test
convert

Item Parameters Conversion
data2pl

Simulated Data Sets
direc

Direct Equating Coefficients
bisectorec

Bisector Equating Coefficients
eqc

Extract Equating Coefficients
equateIRT-package

IRT Equating Methods
chainec

Chain Equating Coefficients
dataDIF

Simulated Data Set with DIF