Game quality
How well each team played, beyond the score: EPA (expected points added) per play, adjusted for the opponent. A big day against a bad defence counts for less. Season views include playoff games.
Nick Mullens — 2022 Every split →
Adj EPA / dropback
+0.500
Raw EPA / dropback
+0.497
Dropbacks
25
Turnover EPA
-4.3
WPA
+0.04
| Week | Opp | Dropbacks | Adj EPA/db | Raw EPA/db | Schedule | Total adj EPA | INT / FL | Turnover EPA | Sacks | Sack EPA | WPA | CPOE |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 9 | WAS | 1 | -1.021 | -1.013 | -0.008 | -1.0 | 0 / 0 | +0.0 | 0 | +0.0 | -0.03 | +26.4 |
| 11 | DAL | 7 | +0.387 | +0.308 | +0.079 | +2.7 | 0 / 0 | +0.0 | 0 | +0.0 | -0.00 | -5.2 |
| 17 | GB | 4 | +1.444 | +1.428 | +0.015 | +5.8 | 0 / 0 | +0.0 | 0 | +0.0 | -0.00 | +46.3 |
| 18 | CHI | 13 | +0.387 | +0.429 | -0.042 | +5.0 | 1 / 0 | -4.3 | 0 | +0.0 | +0.07 | +16.3 |
How the ratings are built
Opponent adjustment. A unit's rating for a game is its average over its other games that season, blended with 16 games' worth of prior (league average plus half of last season's gap from it; 24 games for pass defence, which is noisier). Early in a season that leans on last year; by midseason it is mostly this year. Chosen by how well it predicts a held-out game: it cut that error by about a quarter against no shrinkage, and adjusted numbers agree between odd and even weeks more than raw ones do (team EPA margin r 0.52 → 0.55, defence 0.32 → 0.36, QB EPA/dropback 0.47 → 0.49, 2016–2025).Win expectancy is a logistic fit of wins on EPA margin over 6,036 completed games (it names the winner 86.5% of the time). These describe what happened; one game is not a forecast. Play-by-play credits the quarterback with every sack and dropback, so a bad line shows up in his numbers. Seasons 2016–2026, built 2026-11-07 11:05 UTC, from nflverse. Write-up:
backtests/nfl_game_quality/FINDINGS.md.