When baseball's rookie-of-the-year has a more ordinary second year, we shouldn't be surprised. This fact is easily explained by

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Regression toward the average. This phenomenon explains that extreme performance in one year is likely to be followed by a more typical performance in the next year. Therefore, it is not uncommon for a rookie-of-the-year to have a less impressive second year in baseball.

When Baseball's Rookie-Of-The-Year Has a More Ordinary Second Year, We