College Basketball Peer Rankings

The rankings are a relative look at what peer teams think of each other.  In many ways this relative ranking is similar to other  opponent, or opponent’s opponents ranking/rating systems.  However the granularity of the comparison is not solely based upon margin of victory. The margins of victory are sorted into bins so that a particular team can “judge” its opponents.  It removes the pure linear, or even logarithmic relationship of margin of victory.  The relative relationships per team do NOT consider the team that is “judging.” Once all of the relative relationships per team are computed, an iterative computation of rankings is calculated until it is stable.

The repeat-ability of these relationships (final rankings) is very consistent. This is important because they are computed from scratch (random starts) every day.

College Basketball Peer Voting

The Peer Voting method sorts each game into “bins” according to the margin of victory and location of the game.  Each team keep track of its own opponents, and provides a vote of what it thinks of its own opponents.  This vote is provided based upon the bins.  And it cannot vote for itself.  The number of points assigned to the vote is based upon the number of games it has played.  For example a team that has played 9 games, it assigns 9 points to its top ranked team, 8 to the second, etc.  A maximum of 25 teams ranked by each team.  So later in the season, the lower ranked teams on the list will not get points.

A compilation of all teams’ votes is made and that is what is published.


Credit: Massey’s Ratings for the game data.