search for: equipercentil

...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 v...

...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 v...