[R] [R-pkgs] package ltm -- version 0.4-0

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.be
Mon Mar 13 18:40:20 CET 2006

Dear R-users,

I'd like to announce the new version of package 'ltm' for Item 
Response Theory analysis. The function grm() (along with supporting 
methods, i.e., anova, margins, factor.scores, etc.) has been added for 
fitting the Graded Response Model for ordinal polytomous manifest 
variables. An extra feature of the plot method for classes 'grm', 
'ltm' and 'rasch' is the possibility to plot Item or Test Information 
Curves. You may find a more detailed description of the new features 
of the package in the CHANGES file.

Future plans include development of functions for the three-parameter 
logistic model.

Any kind of feedback (questions, suggestions, bug-reports, etc.) is 
more than welcome.


Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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