On base percentage
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In baseball statistics, on base percentage (OBP) (sometimes referred to as on base average (OBA)) is a measure of how often a batter gets to first base for any reason other than a fielding error or a fielder's choice.
Though extremely unlikely, it is possible for a player's on base percentage to be lower than his batting average (H/AB). If a player had 2 hits and 5 at bats with a sacrifice fly, his batting average would be .400, but his on base percentage would be .333.