South America. I use an algorithm similar to Microsoft's TrueSkill, as this is generally agreed to be better than ELO for team games. Performance is not measured absolutely; it is inferred from wins, losses, and draws against other players. Behind the scenes, the movie claims, the Elo system is employed to rank girls by their attractiveness.
InNate Silver, editor-in-chief of the statistical commentary website FiveThirtyEightand Reuben Fischer-Baum produced Elo ratings for every National Basketball Association team and season through the season.