Defensive Rating is a statistic used in basketball

Basketball

Basketball is a team sport in which two teams of five players try to score points by throwing or "shooting" a ball through the top of a basketball hoop while following a set of rules...

 to measure an individual player's efficiency at preventing the other team from scoring points. It was created by author and statistician Dean Oliver.

Formula

The formula is: Defensive Rating = (Opponent's Points Allowed/ Opponent's Possessions) x 100. The result is the expected amount of points that an individual player will allow on defense over 100 possessions. This stat can be significantly influenced by the defense of a player's teammates.