Player Efficiency Rating (PER)

PER is a player evaluation metric that boils down all of a player’s contributions into one number. John Hollinger‘s formula adds positive stats and subtracts negative ones through a statistical point value system.

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PER largely measures offensive performance. Hollinger freely admits that two of the defensive statistics it incorporates blocks and steals can produce a distorted picture of a player’s value and that PER is not a reliable measure of a player’s defensive acumen.