UIRT: Stata module to fit unidimensional Item Response Theory models

Bartosz Kondratek ()
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Bartosz Kondratek: Educational Research Institute

Statistical Software Components from Boston College Department of Economics

Abstract: uirt is a Stata module for estimating variety of unidimensional IRT models (2PLM, 3PLM, GRM, PCM, GPCM). It features multi-group modelling, DIF analysis, item-fit analysis and generating plausible values (PVs) conditioned via latent regression. uirt implements the EM algorithm (Dempster, Laird & Rubin, 1977) in the form of marginal maximum likelihood estimation (MML) proposed by Bock & Aitkin (1981) with normal Gauss-Hermite quadrature. LR test is used for DIF testing and model based P-DIF effect size measures are provided (Wainer, 1993). Generating PVs is performed by adapting a MCMC method developed for IRT models by Patz & Junker (1999). Observed response proportions are plotted against the item characteristic curves to allow for detailed graphical item fit analysis. Two item-fit statistics are available: S-X2 by Orlando and Thissen (2000) and chi2W developed by the author (Kondratek, 2022).

Language: Stata
Requires: Stata version 10
Keywords: item response theory; differential item functioning; item fit; plausible values (search for similar items in EconPapers)
Date: 2016-10-13, Revised 2023-02-06
Note: This module should be installed from within Stata by typing "ssc install uirt". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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http://fmwww.bc.edu/repec/bocode/u/uirt.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirtFile-URL:ht ... c/bocode/_/chi2w.ado program code (text/plain)
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http://fmwww.bc.edu/repec/bocode/u/uirtFile-URL:ht ... bocode/_/chi2w.sthlp help file (text/plain)
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http://fmwww.bc.edu/repec/bocode/u/uirt_dif.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_dif.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_esf.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_esf.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_icc.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_icc.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_inf.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_inf.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_sx2.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_sx2.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_theta.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/u/uirt_theta.sthlp help file (text/plain)

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