A Fortran 77 subroutine is provided for implementing the Gibbs sampling procedure to a normal ogive IRT model for binary item response data with the choice of uniform and normal prior distributions for item parameters. The subroutine requires the user to have access to the IMSL library. The source code is available at http://www.siu.edu/~epse1/sheng/Fortran/, along with a stand alone executable file.
Sheng, Yanyan and Headrick, Todd C.
"JMASM27: An Algorithm for Implementing Gibbs Sampling for 2PNO IRT Models (Fortran),"
Journal of Modern Applied Statistical Methods:
1, Article 33.
Available at: http://digitalcommons.wayne.edu/jmasm/vol6/iss1/33