The number of Approach the Green strokes a player takes from specific locations and distances are measured against a statistical baseline to determine the player's strokes gained or lost on a hole. The sum of the values for all holes played in a round minus the field average strokes gained/lost for the round is the player's Strokes gained/lost for that round. The sum of strokes gained for each round are divided by total rounds played. The Strokes Gained - concept is a by-product of the PGA TOUR's ShotLink Intelligence Program, which encourages academics to perform research against ShotLink statistical data. Professor Mark Broadie from Columbia Business School developed the early concept which was later defined by the TOUR (2568)
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