PolyCov
A program to compute item parameter
covariances from a polytomous IRT analysis.
The program reads an IRT parameter file and computes covariance of item parameters
for the Graded Response Model using the approach described in
Morris, S. B., Fortmann-Johnson, K., and Oshima, T.C. (2007). An
Evaluation of the Item Parameter Replication Method for DFIT Analysis of
Polytomous Items. Paper presented at the annual conference of the National
Council of Measurement in Education, Chicago,
IL.
This software is copyright (c) 2009 by Dr. Scott B. Morris. It available
free for research or educational purposes. For written permission to use it
for any other purpose, please contact Scott B. Morris, College
of Psychology, Illinois
Institute of Technology, 3105 S. Dearborn, Chicago, IL 60616. Email: scott.morris@iit.edu
Download Program
SAS Macro
The calculations have also been implemented as a SAS Macro, written by,
Pengsheng Ni
Health & Disability Research Institute
Boston University School of Public Health
Boston, MA
psni@bu.edu
Download SAS Macro
Please direct questions regarding the SAS Macro to psni@bu.edu.
PCMCov
A program to compute item parameter
covariances from the Generalized Partial Credit Model.
The program reads an IRT parameter file and computes covariance of item
parameters for the Generalized Partial Credit Model using the approach
described in
This software is copyright (c) 2009 by Dr. Scott B. Morris. It available
free for research or educational purposes. For written permission to use it
for any other purpose, please contact Scott B. Morris, College
of Psychology, Illinois
Institute of Technology, 3105 S. Dearborn, Chicago, IL 60616. Email: scott.morris@iit.edu
Download Program
Problems?
Contact me at scott.morris@iit.edu
Return to My Home
Page
Scott Morris ( scott.morris@iit.edu )
|