Game quality

What each result was worth beyond the score. Every play is graded by EPA (expected points added), then adjusted for who it came against: a defence's rating is what it allowed to everyone else that season, so a big day against a bad defence counts for less. Season views include playoff games.

Daniel Jones — 2021

Adj EPA / dropback
-0.010
Raw EPA / dropback
-0.029
Dropbacks
383
Turnover EPA
-37.3
WPA
+0.68
WeekOpp DropbacksAdj EPA/dbRaw EPA/dbScheduleTotal adj EPA INT / FLTurnover EPASacksSack EPAWPACPOE
1DEN 38 -0.031 -0.037 +0.006 -1.2 0 / 0 +0.0 2 -4.1 +0.17 -3.5
2WAS 36 +0.072 +0.078 -0.006 +2.6 0 / 0 +0.0 4 -7.8 +0.16 +4.4
3ATL 37 +0.135 +0.206 -0.071 +5.0 0 / 0 +0.0 2 -3.0 -0.02 +0.3
4NO 40 +0.520 +0.409 +0.111 +20.8 1 / 0 -0.6 0 +0.0 +0.83 +8.7
5DAL 13 +0.150 +0.068 +0.082 +1.9 0 / 0 +0.0 0 +0.0 +0.02 -17.9
6LA 56 -0.168 -0.263 +0.095 -9.4 3 / 1 -16.6 4 -10.0 -0.21 -9.6
7CAR 35 -0.059 -0.057 -0.002 -2.1 0 / 0 +0.0 2 -3.8 -0.06 +1.1
8KC 35 -0.077 -0.050 -0.027 -2.7 1 / 0 -4.8 3 -3.9 -0.16 -1.7
9LV 22 -0.120 -0.054 -0.066 -2.6 0 / 1 -5.8 2 -7.0 -0.01 +12.8
11TB 40 -0.482 -0.534 +0.052 -19.3 2 / 0 -9.6 2 -5.0 -0.10 -1.7
12PHI 31 +0.096 +0.115 -0.019 +3.0 0 / 0 +0.0 1 -1.1 +0.08 -3.1
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 2026-09-14 01:25 UTC, from nflverse. Write-up: backtests/nfl_game_quality/FINDINGS.md.