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