[R] [R-pkgs] package 'ltm' -- version: 0.3-0

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Tue 27 Sep 2005 - 18:56:13 EST


Dear R users,

I'd like to announce the new version of the package "ltm" (available from CRAN), for fitting Latent Trait Models (including the Rasch and two-parameter logistic models) under the Item Response Theory approach. Three main extra features have been added: (i) now both ltm() and rasch() permit general fixed-value constraints (e.g., useful for scaling purposes), (ii) there is the option to report the estimated parameters under the usual IRT parameterization, and (iii) both plot.ltm() and plot.rasch() are now more flexible. For info about other new features check the help and CHANGES files. Future plans include development of functions for fitting the three-parameter logistic and the graded response models. Any kind of feedback (questions, suggestions, bug-reports, etc.) is more than welcome.

Best,
Dimitris



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/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


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