Model details
Colley résumé proxy—not official Team Success Ranking.
Full national FBS-versus-FBS regular-season results feed a Colley ranking in each simulated season. A sampled rating error allows the final order to differ from that proxy. Rankings are used only when the ACC procedure reaches its external-ranking step. Head-to-head, eligibility, pool construction and restart rules remain in force.
Rating uncertainty is fitted to historical CFP rankings from 2018, 2019, 2021 and 2022, then tested on 2023–2025. Among pairs of ranked teams, the proxy orders about 86% correctly in those held-out seasons; its errors are included in the simulation. SportSource historical ratings were unavailable: using the CFP-fitted uncertainty for SportSource is an unvalidated assumption, not a reproduction of its formula. The model samples one consistent rating order per season and averages qualification over those possibilities to display one probability.
50,000 seasons is a speed and precision budget. At that size, a single probability has an approximate 95% sampling margin of at most 0.44 percentage points. More simulations reduce random sampling noise, not errors in the game forecasts or rating assumptions. The conservative sampling envelope below is separate from model accuracy.
Each comparison forces opposite results under shared national draws, overriding that game’s own pick. Start at 50,000 pairs; refine unresolved differences at 200,000 and 500,000. A paired empirical Bernstein bound allocates the 5% comparison error budget across both tails and all three looks. Below 1 percentage point is a small impact. Coincident displayed estimates or a raw difference below 0.05 points have no meaningful preference; unresolved direction stays neutral at the cap.
Games are sampled independently. This is not a CFP-selection model. Conference appearance does not guarantee a CFP berth. Conditional swings cannot be added together.
Model: colley-fbs-uncertainty-v2 · Seed: 2026
Full methodology and sources · Historical validation and limitations
Snapshot acc-2026-20261110T175505Z · Ranking inputs 73a4fecc492a7600e9f0a6f73deb6ea374c92953b4fdb94b37c730bc2f3d3425