[R] [R-pkgs] package ltm -- version 0.6-0

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.be
Wed Sep 6 09:33:12 CEST 2006

Dear R-users,

I'd like to announce the release of the new version of package 'ltm' 
for analyzing multivariate dichotomous and polytomous data under the 
Item Response Theory approach.

New features:

* function tpm() (along with supporting methods, i.e., anova, plot, 
margins, factor.scores, etc.) has been added for fitting Birnbaum's 
Three Parameter Model.

* grm() can now handle mix of dichotomous and polytomous items.

* descript() returns more output, especially for dichotomous manifest 

For more details check the CHANGES file. Future plans include 
development of functions for goodness-of-fit, and the Partial Credit 

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://med.kuleuven.be/biostat/

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

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