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earned run av·er·age

noun
- 1. a statistic used to measure a pitcher's effectiveness, obtained by calculating the average number of earned runs scored against the pitcher in every nine innings pitched.
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Earned run average
Baseball statistic
In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched. It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Thus, a lower ERA is better. Runs resulting from passed balls, defensive errors (including pitchers' defensive errors), and runners placed on base at the... Wikipedia
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