EPRS9350 (Intro to IRT)
Data
Class.dat: N = 200, NI = 40, Dichotomous dataset (Simulated data), Class10.csv (command delimited data): N = 200, NI = 10, Dichotomous dataset (Simulated data),
FR.dat: N = 1000, NI = 55, Dichotomous dataset (Real data)
N411.zip (N411r.cov, N411f.cov, N411f.sco, and N411.li2): Data files for DIF analysis
N211R.Zip (N211r.cov, DN211f.cov, and DN211f.sco), R3F3_Polycov.zip, dn211dif.csv
Software
CTTITEMsas.zip: Free CTT Item Analysis Macro in SAS, See Lei and Wu 2007
CTTITEMspss.zip: Free CTT Item Analysis Syntax in SPSS, See Lei and Wu 2007
CITAS.zip from Assessment Systems: Free CTT Item Analysis in Excel. Because it is designed for classroom use, CITAS is limited to 50 items and 50 examinees.
For more powerful classical analysis programs, Assessment Systems recommend Lertap and Iteman.
ICC_Excel.xls: A simple, not-fancy, Excel program to plot an ICC (by Oshima), ICC_Excel_DIF.xls: To plot two ICCs to see DIF (by Oshima)
How to
simulate using Excel (by Oshima)
SIMULA.sas: An example of SAS for simulating data (by Oshima), SimProg1.sas, SimProg2.sas : Program used in the SAS for Simulation video
MDSIM: An example of SAS for simulating multidimensional data (by Oshima)
IRTFIT: IRT Model Fit Software, End-User License Agreement, User's Guide (PDF), SAS Macors, Examples (zip)
IRTDIF.zip (IRTDIF.EXE, SAMPLE.OUT, SAMPLE1.COV, SAMPLE2.COV, Batch.txt) by Kim and Cohen, 1991
Equatenp.zip: EQUATE (COMPUTER PROGRAM VERSION 2.1) by Frank B. Baker 1993
Here are more equating programs from the University of Iowa (Center for Advanced Studies in Measurement and Assessment):
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IRTEQ: Windows Application that Implements IRT Scaling and Equating Version 1.1 (2011) Citation: Han, K. T. (2009). IRTEQ: Windows application that implements IRT scaling and equating [computer program]. Applied Psychological Measurement, 33(6), 491-493.
plink: An R Package for Linking Mixed-Format
Tests Using IRT-Based Methods
Jonathan P. Weeks,
University of Colorado at Boulder. (2010) Available at: http://CRAN.R-project.org/package=plink
IRT Scale Transformation Programs (ST, PolyST) from Univerisy of Iowa PolyST
difR (MAGIS, D. D., BÉLAND, S., TUERLINCKX, F., & DE BOECK, P. (2010). A general framework and an R package for the detection of dichotomous differential item functioning. Behavior Research Methods, 42(3), 847-862.)
FYI
EPRS9360 (Advanced IRT)
IPLINK Program, Help File, IPLINK Help in pdf, Description
DIFCUT Program Description
PolyCov: A program to compute item parameter covariances from a polytomous IRT analysis. This software is copyright (c) 2008 by Dr. Scott B. Morris
IRTGEN Program Description
DFIT8 - Manual, For the program, please email Oshima@gsu.edu