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[QUOTE="AZcuse77, post: 2073277, member: 6173"]
From wikipedia

"In its current formulation, the index comprises a team's winning percentage (25%), its opponents' winning percentage (50%), and the winning percentage of those opponents' opponents (25%). The opponents' winning percentage and the winning percentage of those opponents' opponents both comprise the strength of schedule (SOS). Thus, the SOS accounts for 75% of the RPI calculation and is 2/3 its opponents' winning percentage and 1/3 its opponents' opponents' winning percentage.

The RPI lacks theoretical justification from a statistical standpoint. Other ranking systems which include the margin of victory of games played or other statistics in addition to the win/loss results have been shown to be a better predictor of the outcomes of future games. However, because [URL='https://en.wikipedia.org/wiki/Point_shaving']the margin of victory has been manipulated[/URL] in the past by teams or individuals in the context of gambling, the RPI can be used to mitigate motivation for such manipulation."

The other metrics like KenPom and Sagarin are more accurate and do consider things like home/road and margins... RPI is awful and way overvalues strength of schedule over winning games but its opponent rank that's important not road/home or margin.
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