ORB% stands for 'Offensive Rebound Percentage' ( available since the 1970-71 season in the NBA ); the formula is

Offensive Rebound Percentage = 100 * ( ORB * ( Tm MP / 5 )) / ( MP * ( Tm ORB + Opp DRB )).

Offensive rebound percentage is an estimate of the percentage of available offensive rebounds a basketball  (external link) player grabbed while he was on the floor .


190817 ~ About the Offensive rebound Percentage

Offensive rebound percentage (ORB%) is a basketball statistic that puts a player's number of offensive rebounds in proportion to the total number of offensive rebounds available while they were in active play. It is intended to be representative of part of a player's ability.
Robert Niles

Basketball  (external link)
A study of the value of offensive rebound s  (external link)

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