A Page for Finding Software

Software on this page is (largely) for download-test

The authors make no warranties, expressed or implied, about the usefulness for any purpose of the software the can be downloaded from this page. All software downloaded from this page is free, and may be freely distributed. However, the software should not be sold, or used commercially in any way, without the expressed consent of the author(s).

PlotIRT: A Collection of R Functions to Plot Curves Associated with Item Response Theory

The PlotIRT set of R functions facilitates plotting a variety of curves associated with item response theory: item and test characteristic curves, item and test information curves, expected item score functions, and posterior density distributions. The user can specify colors, labels, the number of plots in a window, the number of items within a plot, font sizes, and a variety of other options. The R functions are applicable to the two-parameter logistic, three-parameter logistic, graded, nominal, and multiple-choice models. Basic R functions can be used to read in an assortment of item parameter files, or item parameters can be directly typed into R arrays. Plots can be saved as any file type supported by R, including postscript and portable document format. PlotIRT runs on any Windows or Mac-based computer with R installed. R, a free software environment for statistical computing and graphics, can be downloaded from a mirror at http://cran.r-project.org/. Click here to download a .zip file containing the PlotIRT source code, documentation, and example files.

Augment v. 2

Augment is software that computes augmented subscores using procedures described in chapter 9 of Test Scoring. Click here to download Augment for Windows, or Click here to download Augment for the Mac OS v 9.x or X. [Note: For Mac OS v. 9.x, if your system does not already have Carbonlib, that required system extension may be obtained from Apple's download page.] For either platform, the download archive includes the application, a test file, and the documentation in .pdf format.

IRTScore

IRTScore is software that computes summed-score to EAP(theta) translation tables, and the values and weights used in linear IRT response-pattern scoring, given parameters from Multilog output files or space- or tab-delimited files. Click here to download IRTScore for Windows, or Click here to download IRTScore for the Mac OS v 9.x or X. [Note: For Mac OS v. 9.x, if your system does not already have Carbonlib 1.4 or higher, it is necessary to drag the extension "Carbonlib" (included in the .sit file) to the (closed) System folder and then restart the computer.] For either system, the download archive includes the application, a test file, and the documentation in .pdf format.

SScore

SScore is software that computes summed-score to EAP(theta) translation tables, given parameters from Multilog output files or space- or tab-delimited files. Click here to download SScore1.2 for Windows, or Click here to download SScore 1 for the Mac OS v 9.x. For either system, the download archive includes the application, a test file, and the documentation in .pdf format.

IRTLRDIF v. 2

IRTLRDIF is software that computes likelihood ratio tests of DIF for the 3PL and graded IRT models. Click here to download IRTLRDIF 2 for Windows, or Click here to download IRTLRDIF 2 for the Mac OS v 9.x or X. [Note: For Mac OS v. 9.x, if your system does not already have Carbonlib 1.4 or higher, it is necessary to drag the extension "Carbonlib" (included in the .sit file) to the (closed) System folder and then restart the computer.] For either system, the download archive includes the application, a test file, and the documentation in .pdf format.

Multilog

Multilog provides parameter estimates for several item response theory models, including the one-, two-, and three-parameter logistic models, as well as models for items with several graded or nominal responses, and multiple-choice items. The current version of Multilog (7.0) is available only for MS Windows machines. Multilog is not available to be downloaded. It is commercial software, and can be obtained from Scientific Software International (SSI), 7383 N. Lincoln Avenue, Suite 100, Lincolnwood, IL 60646-1704, or by calling 800-247-6113 or 847-675-0720 (fax 847-675-2140). The Multilog FAQ page is also at the SSI site.

TestGraf

J.O. Ramsay's TestGraf software for MS-DOS machines provides a graphical analysis of multiple-choice test items and/or rated responses using Ramsay's "kernel smoothing" approach to item response theory. The software and its documentation are available via anonymous FTP from the TestGraf site.