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A player's runs per plate appearance, relative to the league average - 100 means average, 120 is 20% better than average, etc.
RPA+ is computed as:
Where lgRPA is the league runs per plate appearance, adjusted to match a player's run environment (adjusted for park, in other words). The scale of RPA+ should correspond with that of OPS+ and similar metrics; it will produce the same rank order as True Average, however.
RPA_PLUS appears in the following BP Glossary Categories: