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First, thanks for sharing the CPI poll. It appears to take the same basic approach as Colley but limits the computation to two orders (opponents opponents), whereas Colley uses a matrix method to include all opponents (I think - but his math is over my head). Not surprising that the results are similar at this stage of the season.
Your last point is significant. These polls don't attempt to rank the best team - they rank who is having the better season. One can be computed, the other is more subjective. I think that point may have been missed by some posters.
They have a different definition of “best”. Maybe there’s a third point of view, but models usually fall on the spectrum of “resume” (what have you accomplished) vs predictive (how likely are you to win and score way more points than the other team).
For the polls, they usually fall somewhere in between, where being ranked #1 is some combination of “we think you’re likely to beat anyone” vs “they had the best record”.
For JMU, you can argue that they’ve accomplished more than UGA this season. That’s what the Colley matrix says. It’s an **resume** system. Even the guy who wrote that system probably wouldn’t bet on them against UGA. It starts out with everyone the same because everyone starts at zero for a new season—ain’t nobody done nothing yet. Everybody is equal in resume at the start of the season, because you don’t count last season’s games.
For predictive models, they do start with a seed or starting point, because they want to guess what the score is going to be for any game, including the first one.
Both types are only getting to be decent statistically now.