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.

Kyler Murray — 2026 Every split →

Adj EPA / dropback
-0.103
Raw EPA / dropback
-0.066
Dropbacks
136
Turnover EPA
-8.6
WPA
-0.31
WeekOpp DropbacksAdj EPA/dbRaw EPA/dbScheduleTotal adj EPA INT / FLTurnover EPASacksSack EPAWPACPOE
1GB 5 -0.898 -0.894 -0.004 -4.5 1 / 0 -4.1 0 +0.0 -0.07 +6.4
3TB 32 -0.374 -0.378 +0.004 -12.0 1 / 0 -4.5 3 -4.6 -0.38 -3.9
4MIA 41 -0.140 -0.016 -0.124 -5.7 0 / 0 +0.0 4 -8.1 +0.03 +7.6
5NO 31 +0.269 +0.270 -0.001 +8.3 0 / 0 +0.0 2 -3.3 +0.01 +11.8
7IND 27 -0.004 -0.003 -0.001 -0.1 0 / 0 +0.0 3 -3.7 +0.09 -7.5
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.