The R package agrmt calculates agreement in ordered rating scales. It principally implements Cees van der Eijk's (2001) measure of agreement A, which can be used to describe agreement, consensus, or polarization among respondents.
There is an implementation for Stata available from Alejandro Ecker: ideas.repec.org/c/boc/bocode/s457287.html.
The following functions are available in the package: agreement, polarization, ordinal dispersion, AJUS classification, ISD classification, and (multiple) modes. The package also includes alternative and related measures to Van der Eijk's: measures of consensus (dispersion) by Leik, Tatsle and Wierman, Blair and Lacy, Kvalseth, and Berry and Mielke.
The R package agrmt is open source distributed under the GNU General Public License (GPL). It is written and maintained by Didier Ruedin.
Last update 10 March 2015