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Why is on-base percentage important in sabermetrics?

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Green retro manual baseball scoreboard beyond an empty, neatly mowed baseball field with brown infield dirt and striped grass outfield. — Sabermetrics A scoreboard provides some – but not necessarily the most useful – data on player and team performances in baseball.

In sabermetrics, on-base percentage (OBP) is considered a superior tool for evaluating a hitter compared to traditional batting average because it provides a more comprehensive measure of a player's ability to avoid making an out.1

While batting average only accounts for hits, OBP tracks the frequency with which a batter reaches base via hits, walks, or being hit by a pitch. By valuing these additional ways of reaching base, sabermetricians gain a more accurate understanding of a player's offensive contribution.1

The importance of this metric is further highlighted by its role in calculating OPS (on-base plus slugging percentage), a statistic that combines OBP and slugging percentage to create a more complete picture of a hitter's dominance. By emphasizing the value of not making an out, OBP serves as a fundamental component in modern analytical efforts to quantify a player's total offensive impact.21