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JordansBulls
07-04-2010, 10:32 AM
http://www.basketball-reference.com/about/glossary.html

WS
Win Shares (available since the 1951-52 season in the NBA); an estimate of the number of wins contributed by a player.



PER
Player Efficiency Rating In John's words, "The PER sums up all a player's positive accomplishments, subtracts the negative accomplishments, and returns a per-minute rating of a player's performance."


So both are based on a player's performance as an individual.