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Pedantic wrote:An ERA of INF is not explicitly infinity. A better term to use would be undefined.
ERA is determined by the following calculation:
Multiply the number of earned runs by nine. Then divide by the number of innings pitched.
Example: If your staff gives up 15 earned runs in 50 innings, your staff ERA is 2.90. (15 x 9 = 145. 145/50 = 2.90)
A starter who has a high ERA for lots of innings will hurt your overall ERA more than a reliever who has the same high ERA for only a few innings
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