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Which is the best college football conference in 2019?

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 defense · 2019

FBS medianSECBig TenAmerican Athlet…Big 12ACCPac-12Mountain WestConference USAFBS IndependentsSun BeltMid-American

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
SEC14-7.814.0Auburn -21.4
Big Ten14-7.215.2Ohio State -19.9
American Athletic12-3.011.8Cincinnati -11.6
Big 1210-2.44.3Baylor -14.0
ACC141.010.3Clemson -27.6
Pac-12121.613.4Oregon -15.9
Mountain West122.613.1San Diego State -11.3
Conference USA143.614.1Western Kentucky -8.2
FBS Independents63.913.7Notre Dame -13.5
Sun Belt104.48.6App State -8.7
Mid-American128.18.9Buffalo -5.0

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.