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Possession is arguably the most important metric to understand basketball analytics basics. Pace, offensive efficiency, and defensive efficiency metrics are all based on how the possession is calculated. Given the fact that two teams use almost the same number of possessions in a game, it is easy to calculate offensive and defensive efficiency numbers, when the possession count assumed to be 100.
How the Possession is Calculated?
It counts as a team possession every time when a player of that team;
(1) attempts a field goal,
(2) misses a shot and does not get the offensive rebound,
(3) turns the ball over (some sources add “turnovers that are assigned to teams” for a more precise possession calculation),
(4) goes to the line for two or three shots and either makes the last shot or does not get the rebound of a missed last shot.
What are the .44 and .96 Multipliers?
.44 multiplier has to be taken into account because not all free throws take up a possession. Technical foul shots along with “and 1’s” do not, while there are more than two free throws on one possession with a three-shot foul. Research has determined that about 44% of all free throws take up possessions. The .96 multiplier accounts for team offensive rebounds in situations where a missed shot is tipped out of bounds by a defensive player, continuing the possession without an offensive rebound being credited.