Baseball Rules and Regulations

How do you determine percentages in stats such as batting average and ERA?


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2015-07-15 19:12:51
2015-07-15 19:12:51

Batting average is hits divided by at bats (hits + outs + reached on error).

ERA is earned runs divided by innings pitched, then multiplied by nine (in other words, the average number of earned runs given up over nine innings).

For more info: baseball-almanac

reaching on error counts as an out so. Remember BB(walks), sac bunts, sac flies and HPB do not count as plate appearences.


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It means Batting Average Against. It is used to show what opposing hitters are hitting off of a particular pitcher. For example, Randy Johnson had a .197 BAA in the 2004 season. That means opposing hitters had a .197 batting average against him that season.

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