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Batting Average on Balls In Play
A pitcher's average on batted balls ending a plate appearance, excluding home runs. Based on the research of Voros McCracken and others, BABIP is mostly a function of a pitcher's defense and luck, rather than persistent skill. Thus, pitchers with abnormally high or low BABIPs are good bets to see their performances regress to the mean. The league average for modern pitcher BABIP is around .300.
Hitter BABIP is much more of a skill, based on how well they are able to hit and place the ball, along with their speed.
Equation:
BABIP = (H - HR) / (AB - K - HR + SF + SH)
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