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Known in full as Ratings Percentage Index (RPI), it is an algorithm that attempts to accuately rank all Division I NCAA teams. It is easy enough to rank each team within their own division or conference since they play these teams often and can be compared directly by their Conference W-L record. However, not all conferences are of the same calibre despite the fact that they are in the same NCAA Division. The teams in the SEC are of a higher calibre than the teams in the America East Conference. Yet it is possible for a team in the America East to be 25-2 and a team in the SEC to be 9-17. This does not mean the team in the America East is a better baseball team since the SEC team plays tougher competition. The RPI algorithm takes into consideration a school's calibre of schedule and the schedule of those direct opponents before ranking each school. Therefore, it is very possible that a team in the SEC that is 9-17 finds itself higher in the rankings than the 25-2 team in the America East because the calibre of schedule between the 2 teams is far from equal.
The Baseball Cube has full rankings since 2000 for NCAA Division I schools. The final rankings are released at the conclusion of the College World Series in June.