Calculating Individual Offensive and Defensive Ratings | Basketball-Reference.com
Offensive Rating
In Dean's words, "Individual offensive rating is the number of points produced by a player per hundred total individual possessions. In other words, 'How many points is
a player likely to generate when he tries?'"
The basic building blocks of the Offensive Rating calculation are Individual Total Possessions and Individual Points Produced. The formula for Total Possessions is broken down into four components: Scoring Possessions, Missed FG Possessions, Missed FT Possessions, and Turnovers.
Defensive Rating
Just as Oliver's Offensive Rating represents points produced by the player per 100 possessions consumed, his Defensive Rating estimates how many points the player allowed per 100 possessions he individually faced while on the court.
The core of the Defensive Rating calculation is the concept of the individual Defensive Stop. Stops take into account the instances of
a player ending an opposing possession that are tracked in the boxscore (blocks, steals, and defensive rebounds), in addition to an estimate for the number of forced turnovers and forced misses by the player which aren't captured by steals and blocks.
The formula for Stops is: