TL;DR: calculating usage rate by tracking current players on the floor and plays made, play by play.
The usage rate (usage percentage) is often quoted by the talking heads of ESPN and Fox Sports as an advanced metric to an NBA player’s impact on the floor. According to basketball-reference.com,
“Usage percentage is an estimate of the percentage of team plays used by a player while he was on the floor.”
And the formula behind the metric is:
Rising Senior at NYU. I like sports and data, mutually exclusively and inclusively.