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This indicates whether or not a player was a rookie during that season. To be a rookie, a player must have fewer than 130 at-bats and 50 innings pitched.
MLB will exclude players who have spent at least 45 days on a 25-man roster from eligibility for rookie of the year. Due to lack of service time data historically we do not exclude those players, so the rookie flag may not correspond exactly with award eligibility.
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