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Errors don't count as at bats... i'm sure on that one >>
Actually, they do count as at bats. An at bat without a hit. I can't find a page that describes what constitutes an at bat, but
this page has a description of a plate appearance, which is
At-Bats + Bases on Balls + Hit By Pitcher + Sacrifice Hits + Sacrifice Flies + Times Reached on Defensive Interference. If you subtract off everything else, then an at-bat is a hit, reached on an error, reach on a fielders choice, or produced an out that was not a sacrifice.
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An error is an at-bat if the batter would have made an out had the error not occured. >>
That is a little more precise. If the batter
reaches base on an error, it is an at bat without a hit. If the batter takes an extra base because of an error, it is an at bat, a hit, and an error.