Major league general managers must decide every year whether a promising minor league player is ready to be brought up to the major league team. Of course, the minor league player faces inferior pitching in the minors, so he is not expected to duplicate his minor league statistics when he is brought up to the majors. In 1985 Bill James developed Major League Equivalents to help major league front office personnel determine whether a minor leaguer is ready for the majors.

The Excel file mle.xls gives the OBP for a set of hitters whose last minor league year was played at the AAA level. These hitters played in either the American Association (AA), International League (INT), or Pacific Coast League (PCL). The file ...

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