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ERA+ is a measure of a pitcher's ERA adjusted for the effects of the ballpark they pitch in and the league average ERA. It is calculated using a complex formula that takes into account the league ERA, the player's ERA, and the park factor.
Also available at this site is The Baseball Statistics System, a free Windows application developed by Randy Myers, which is an interactive interface to the data. Documentation on this is available here. Retrosheet.org
Includes options for postseason and All-Star games. Find the best (or worst) statistical spans for any number of games. or see head to head results between teams, players, player vs. team, or batter vs. pitcher. matching a variety of criteria and get a summary line for all matching plays.
ERA+ takes a player's ERA and normalizes it across the entire league. It accounts for external factors like ballparks and opponents. It then adjusts, so a score of 100 is league average, and 150 is 50 percent better than the league average.
ERA+ takes a player's earned run average (ERA) and normalizes it across the entire league. It accounts for external factors like ballparks and opponents. A score of 100 is league average, and 150 is 50 percent better than the league average.
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Adjusted ERA+, often simply abbreviated to ERA+ or ERA plus, is a pitching statistic in baseball. It adjusts a pitcher's earned run average (ERA) according to the pitcher's ballpark (in case the ballpark favors batters or pitchers) and the ERA of the pitcher's league.
