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Onbase plus slugging (OPS) is a sabermetric baseball statistic calculated as the sum of a player's onbase percentage and slugging percentage.^{[1]} The ability of a player to both get on base and to hit for power, two important hitting skills, are represented. An OPS of .900 or higher in Major League Baseball puts the player in the upper echelon of hitters. Typically, the league leader in OPS will score near, and sometimes above, the 1.000 mark.
Contents
Formula
The basic formula is
where OBP is onbase percentage, and SLG is slugging percentage. These percentages are defined
and
where:
Although OBP and SLG have different denominators, it is possible to rewrite the expression for OPS using a common denominator. This expression is mathematically identical to the simple sum of OBP and SLG:
Interpretation of OPS
Unlike many other statistics, a player's OPS does not have a simple intrinsic meaning, despite its usefulness as a comparative statistic.
One fault of OPS is that it weighs onbase average and slugging percentage equally, although onbase average correlates better with scoring runs^{[citation needed]}. Statistics such as wOBA build on this distinction using linear weights, avoiding OPS' flaws. Magnifying this fault is that the numerical parts of OPS are not themselves typically equal (leagueaverage slugging percentages are usually 75100 points higher than leagueaverage onbase percentages). As a point of reference, the OPS for all of Major League Baseball in 2008 was .749^{[2]}.
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