A metric that estimates how many points an individual player allows per 100 team possessions. This concept is also used to determine a team's points allowed per 100 possessions.
Defensive Rating uses the same theoretical base as Offensive Rating, but looks at points allowed as opposed to points produced. This statistic actually started out as a way to determine how many points a team allowed per 100 possessions.
However, the originator of this formula, Dean Oliver, moved this concept to the player level as a way to estimate a player's defensive contribution to his team. Oliver details the player-specific version of Defensive Rating, along with many other key statistical concepts, in his landmark 2003 book Basketball on Paper.
Some of the all-time leaders in this category include Elmore Smith, Gar Heard, Dave Cowens, David Robinson and Clifford Ray.