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Which is the best college football conference in 2017?

Analysis

Every FBS team is a dot. Conference averages are not shown, and that is the point: the SEC’s mean is dragged up by four teams, the Big Ten’s spread is twice the Sun Belt’s, and a bar chart of means says none of it. What “compare the conferences” actually asks is how much of one league sits inside the other.

CORE overall · 2017

FBS medianACCBig 12SECPac-12Big TenAmerican Athlet…FBS IndependentsConference USAMid-AmericanMountain WestSun Belt

One dot per team, one tick per conference median. Leagues are ordered by median, and the mean is deliberately not shown — four teams drag it and it hides how far the two distributions overlap.

ConferenceTeamsMedianSpreadBest
ACC1411.013.0Clemson 30.3
Big 12109.619.9Oklahoma 36.4
SEC147.318.6Georgia 39.6
Pac-12126.015.4Washington 21.4
Big Ten145.927.0Ohio State 36.2
American Athletic12-2.822.7UCF 23.9
FBS Independents4-3.125.3Notre Dame 20.8
Conference USA14-5.519.7Florida Atlantic 6.5
Mid-American12-5.817.1Ohio 7.6
Mountain West12-10.623.4Boise State 8.9
Sun Belt12-13.819.9Troy 8.2

Two numbers, not one

Median answers “how good is this league”. Spread — the interquartile range — answers “how evenly good”, and it is usually the more interesting of the two. A league with a high median and a huge spread is four contenders and eight teams padding their records, which is exactly the shape that produces a conference champion who keeps losing in January.

Note which metric you are looking at. CORE is opponent-adjusted, so it can be compared across leagues honestly. The raw metrics cannot: a conference that plays itself twelve times has its schedule strength baked into every raw number, which is the single most common way conference comparisons go wrong.