Published by the Foundation for Open Access Statistics Editors-in-chief: Bettina Grün, Torsten Hothorn, Rebecca Killick, Edzer Pebesma, Achim Zeileis    ISSN 1548-7660; CODEN JSSOBK
[test by reto]
Authors: Michela Battauz
Title: equateIRT: An R Package for IRT Test Equating
Abstract: The R package equateIRT implements item response theory (IRT) methods for equating different forms composed of dichotomous items. In particular, the IRT models included are the three-parameter logistic model, the two-parameter logistic model, the one-parameter logistic model and the Rasch model. Forms can be equated when they present common items (direct equating) or when they can be linked through a chain of forms that present common items in pairs (indirect or chain equating). When two forms can be equated through different paths, a single conversion can be obtained by averaging the equating coefficients. The package calculates direct and chain equating coefficients. The averaging of direct and chain coefficients that link the same two forms is performed through the bisector method. Furthermore, the package provides analytic standard errors of direct, chain and average equating coefficients.

Page views:: 1585. Submitted: 2013-07-13. Published: 2015-12-27.
Paper: equateIRT: An R Package for IRT Test Equating     Download PDF (Downloads: 2599)
equateIRT_1.2-2.tar.gz: R source package Download (Downloads: 128; 500KB)
v68i07.R: R replication code Download (Downloads: 187; 3KB)

DOI: 10.18637/jss.v068.i07

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Paper: Creative Commons Attribution 3.0 Unported License
Code: GNU General Public License (at least one of version 2 or version 3) or a GPL-compatible license.