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st: New and updated modules under SSC / Rasch analyses


From   Jean-Benoit Hardouin <jean-benoit.hardouin@orscentre.org>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: New and updated modules under SSC / Rasch analyses
Date   Wed, 06 Apr 2005 15:44:45 +0200

Thanks to Kit Baum, several modules have been added or updated under SSC :
- geekel2d is a new module who allow to estimate the parameters of several uni- and bi- dimensional IRT model of the Rasch family (Rasch model, OPLM, model of Kelderman and Rijkes, multidimensional generelized Rasch model, multidimension marginally sufficient Rasch model) with GEE. This module is available for Stata 7 or more recent version of Stata. geekel2d require the ghquadm module who is not referenced under SSC (findit ghquadm).
- raschtest is an updated version of this module who allow to estimate the parameters of the Rasch model (CML, MML or GEE), and to realize several test (van den Wollenberg Q1, Andersen Y, Wright and Panchapakesan) and to display graphical representations (traces, information graph...). In this new version, it is possible to use GEE for the estimation (with the module geekel2d) and to automatically create groups of scores to made the tests more powerfull. This module is available for Stata 8.
- raschtestv7 is a new module who is equivalent to raschtest for Stata 7 (mainly concerning the graphical representations displayed with the graphical syntax of Stata 7. In fact, raschtestv7 is the main program run under raschtest and is required to run it !!
- gammasym is an updated version of this module who is now available for Stata 7 and more recent version of Stata. This command is required for raschtest and raschtestv7.

Jean-Benoit Hardouin

**************************************************************************
Jean-Benoit Hardouin
Biostatistician
Regional Health Observatory, Orléans, France
Email : jean-benoit.hardouin@orscentre.org
**************************************************************************

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