Wins Above Replacement, commonly known as WAR, is a non-standardized sabermetric baseball statistic that is used to show how many more wins a player would give a team as opposed to a "replacement level", or minor league/bench player at that position. While WAR values are scaled equally for pitchers and hitters, the result is calculated differently for pitchers versus position players: position players are evaluated using statistics for fielding and hitting, while pitchers are evaluated using statistics related to the opposing batters' hits, walks and strikeouts.
There is no clearly established formula for WAR. Sites that provide the statistic, such as Baseball Prospectus, Fangraphs, and Baseball Reference, all calculate it differently; however, all of these sites calculate the value of WAR using these principles, and each site publicly acknowledges their methods for calculating their individual WAR values.
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