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.

Jameis Winston — 2023

Adj EPA / dropback
-0.220
Raw EPA / dropback
-0.200
Dropbacks
49
Turnover EPA
-8.2
WPA
-0.21
WeekOpp DropbacksAdj EPA/dbRaw EPA/dbScheduleTotal adj EPA INT / FLTurnover EPASacksSack EPAWPACPOE
3GB 17 -0.160 -0.148 -0.011 -2.7 0 / 0 +0.0 1 -1.2 +0.03 -5.3
4TB 1 -2.859 -2.822 -0.037 -2.9 1 / 0 -2.8 0 +0.0 -0.00 -34.6
10MIN 26 -0.194 -0.175 -0.019 -5.0 2 / 0 -5.3 1 -1.2 -0.15 -5.8
13DET 5 -0.034 +0.023 -0.056 -0.2 0 / 0 +0.0 0 +0.0 -0.09 -21.8
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.