BYULV wrote:
Does anyone know why RPI and Sagarin's ratings are so different? BYU and UNM are basically flip-flopped in these two. Sagarin has BYU at #9 and UNM at #23 whereas realtime RPI is almost the exact opposite.
RPI isn't actually a ranking (as in, it's not a statistical formula that incorporates a lot of different factors to try to say definitively which is the "best" team). It's a simple formula:
Team's winning percentage * 25%
Team's Opponents' winning percentage * 50%
Team's Opponents' Opponents' winning percentage * 25%
It is just one tool to determine overall strength of a team (but not necessarily their strength of schedule, though that obviously factors in, as you can see). Humorously, as simple as it is, it's actually about as accurate as (sometimes better than) the statistical rankings that supposed professionals concoct when all's said and done. Kinda funny.
If Sagarin sez we're worse than our RPI does, that means according to him, we've beaten team's that have played easy schedules, or we've beaten teams who have beaten teams who have played easy schedules, and uses different stastistical tricks to weight (read: BIAS) which wins are actually good wins and which wins aren't on any given team's schedule, and not just the wins themselves.