st: New and updated modules under SSC / Rasch analyses

[Jean-Benoit Hardouin <jean-benoit.hardouin@orscentre.org>]

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, Orl�ans, France
Email : jean-benoit.hardouin@orscentre.org
**************************************************************************

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