IRT Tutorial FAQ
This page represents Ben-Roy Do's personal response to some questions asked by IRT tutorial web site visitors since July 2005. This section will unlikely to be updated from time to time. This page is for historical reference only.
A. General questions
B. Data preparation questions (e.g., SPSS)
C. Investigation of Dimensionality questions (e.g., SYSTAT)
D. IRT Models questions (e.g., BILOG, BILOG-MG, MULTILOG7)
E. Model-data Fit questions (e.g., MODFIT)
F. DIF/DTF questions (e.g., ITERLINK)
Note: To receive the latest copy of MODFIT (e.g., Stark, 2007), please contact Professor Stephen Stark at University of South Florida,