The Rating Percentage Index, or RPI, is the biggest aid for the NCAA March Madness Selection Committee to determine which teams make it in March Madness, where they rank, and which teams are left out (ESPN). The RPI is also the simplest of the many ranking indices out there (ESPN), like:

1. Basketball Power Index or BPI by ESPN
2. Sagarin Index by Jeff Sagarin
3. KenPom by Ken Pomeroy
4. Massey Ratings

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