The 'equate' package, designed for statistical equating (non-IRT) of
test score distributions, is available on CRAN:
http://cran.r-project.org/package=equate
The package was developed for both research and teaching purposes, and
will hopefully be useful for both. A vignette introduces the basic
concepts and terminology of traditional equating, and demonstrates the
functionality of the package.
Mean, linear, equipercentile, and circle-arc equating are supported and
specific methods include Tucker, Levine observed score, Levine true
score, Braun/Holland, frequency estimation, and chained equating (linear
and nonlinear). Univariate and bivariate presmoothing are also
supported, as is estimation of standard error via bootstrapping.
Additional info can be found at the rwiki:
http://rwiki.sciviews.org/doku.php?id=packages:cran:equate
Suggestions are much appreciated!
Thanks
Tony
____________________________________________
Tony Albano
University of Minnesota
193 Education Sciences Building
56 East River Road
Minneapolis, MN 55455
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