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.

Tyson Bagent — 2026 Every split →

Adj EPA / dropback
-0.121
Raw EPA / dropback
-0.075
Dropbacks
67
Turnover EPA
-14.3
WPA
-0.26
WeekOpp DropbacksAdj EPA/dbRaw EPA/dbScheduleTotal adj EPA INT / FLTurnover EPASacksSack EPAWPACPOE
2MIN 9 -0.153 -0.294 +0.140 -1.4 0 / 0 +0.0 1 -2.6 -0.18 +8.0
4NYJ 35 +0.115 +0.227 -0.111 +4.0 1 / 0 -5.8 1 -0.6 +0.18 +8.0
5GB 23 -0.467 -0.448 -0.019 -10.7 2 / 0 -8.4 2 -2.2 -0.26 -10.9
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 2026-10-28 11:05 UTC, from nflverse. Write-up: backtests/nfl_game_quality/FINDINGS.md.