Overview

BradleyTerry is a package for the R statistical computing environment, designed to facilitate the specification and fitting of Bradley-Terry models for pair comparison data, including structured versions where there are "player"-specific explanatory variables.

Find an extended overview in the Journal of Statistical Software.

The package sources, and windows binary, are available at CRAN sites for installation into R in the standard way.

The BradleyTerry software is made available free, under GPL version 2. It comes with ABSOLUTELY NO WARRANTY.

Version history

0.8-5: minor bug-fixes and error trapping improvements (2005-08-04)
0.8-4: fixed a bug in add1.BTm (2005-03-20)
0.8-2: corrected a couple of small bugs, improved the documentation (2005-01-06)
0.7-2: some extra components added to BTm objects; update.BTm removed, since no longer needed (2004-05-28)
0.7: reliability improvements to add1.BTm, drop1.BTm and update.BTm; new methods terms.BTm and formula.BTm added (2004-05-25)
0.6-1: minor revision of the overview document (2004-01-26)
0.6: first public release (2004-01-21)

Related links:

• CRAN (for R)
• David's home page