PROa

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Adjusted Production -- From Total Baseball. Also denoted as PRO+. It's a park- and league-adjusted version of OPS to compare players from different eras. Defined as:
PROa = (OBP / LgOBP) + (SLG / LgSLG) - 1
where OBP and SLG have been adjusted for the player's home park, and LgOBP and LgSLG are the league average OBP and SLG, respectively. A PROa of 100 is league average.
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