luckadjusted

Week 4 2019 · September 26, 2019

No FTN charting for this game (drops and interception-worthy throws are not modelled).

Eagles at Packers, Week 4 2019: who deserved to win?

The Eagles beat the Packers 34–27, and it was no fluke: replayed with the way both teams actually played, the Eagles win 8 of 10. The Packers had the bounces: judgment calls alone were worth 7.2 points to the Packers.

An off day for the Packers: their defense played far below its usual level. In a fresh game against the Eagles they would win 58% of the time; with this day’s form, 16%. The numbers

Before kickoff the Packers were 60% favorites. The biggest swing (Q4, 9:08 left): the Packers were stopped on 4th & 1, worth 13 points of win probability to the Eagles.

Final

Philadelphia Eagles 34
Green Bay Packers 27

September 26, 2019 · Lambeau Field · Closing line: Packers −3.5

Luck index +16 Eagles about even · −16 Packers

Each team’s own plays from this game, resampled into new drives 4,000 times: with the way both teams actually played, how often does this performance win? How the replay works

Ten replays. Eagles win 8, Packers win 2.

  1. 1 PHI 45 GB 13
  2. 2 PHI 35 GB 10
  3. 3 PHI 35 GB 17
  4. 4 PHI 30 GB 16
  5. 5 PHI 30 GB 20
  6. 6 PHI 30 GB 23
  7. 7 PHI 17 GB 13
  8. 8 PHI 40 GB 38
  9. 9 PHI 30 GB 33
  10. 10 PHI 28 GB 41

Three other ways to ask

Each answers a different question, so none of them replaces the replay above.

The closing betting line, turned into a probability. What everyone knew before the game.

The line plus what this game showed, weighted by how much one game can tell. It stays close to the line because one game says little.

Every kick, fumble bounce, drop, conversion and judgment call redrawn; everything else fixed. The narrowest view of luck.

An off day for the Packers

Their defense played far below its usual level. In a fresh game against the Eagles they would win 58% of the time; with this day’s form, 16%.

41 points apart for the Packers: the gap is how differently this game went from what the two teams usually are.

UnitThis gameUsual levelBetter or worse than usual
Eagles offenseEPA per play gained +0.29 +0.13 better by 0.16
Eagles defenseEPA per play allowed +0.32 +0.12 worse by 0.20
Packers offenseEPA per play gained +0.32 +0.09 better by 0.23
Packers defenseEPA per play allowed +0.29 +0.12 worse by 0.17

EPA (expected points added) per play on competitive snaps, turnovers left out because they are valued as luck. Usual level: the team’s earlier games this season plus half of last season, pulled toward the league average. One team’s defense and the other team’s offense are the same snaps, so one game can’t fully say whose day it was; it shows how far this one was from both teams’ norms.

How 4,000 replays ended

Eagles win 84% of them, Packers 16%, counting the 1% still level after regulation as half each. The line is what actually happened: Eagles by 7.

Show as a table
Final margin in the replaysShare of replays
Eagles by 17+35.9%
Eagles by 9–1622.1%
Eagles by 1–824.9%
Level after regulation1.1%
Packers by 1–810.0%
Packers by 9–164.7%
Packers by 17+1.4%

Where the luck was

Take the luck out

The final margin was Eagles by 7. Remove the luck, one kind at a time, and it becomes Eagles by 13.1.

Each row takes one kind of luck out of the margin. Color shows which team it helped. Luck shares are the fitted ones (how much of each component is luck).

The kicks

How likely each kicker was to make that kick (his own record, the distance and the weather), and what happened.

  • M. Crosby, 30 yds made · 96% expected
  • M. Crosby, 31 yds made · 96% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Packers’ chance of winning

As low as 0% and as high as 86%. Numbers mark the biggest luck moments, listed below.

nflfastR’s in-game win probability. It ignores the betting line, so it starts near even. Shaded above the middle while the Packers were ahead in it, below while the Eagles were.
#WhenWhat happenedWin probability forNext drive
1 Q2 2:00 The Packers fumbled and the Eagles recoveredFumble bounces · loose balls are close to 50/50 +10% PHI GB: Touchdown
2 Q3 4:40 The Packers converted 3rd & 73rd & 4th downs · 34% expected +7% GB GB: Touchdown
3 Q3 0:32 The Eagles converted 3rd & 103rd & 4th downs · 32% expected +9% PHI PHI: Touchdown
4 Q4 12:05 Unnecessary Roughness on the Eagles (Zach Brown), 15 yardsJudgment calls · 0 flags in 147 snaps before, position avg 1 per 393 +10% GB GB: Turnover on downs
5 Q4 10:52 The Packers converted 3rd & 63rd & 4th downs · 37% expected +7% GB GB: Turnover on downs
6 Q4 9:12 The Packers were stopped on 3rd & 13rd & 4th downs · 67% expected +10% PHI GB: Turnover on downs
7 Q4 9:08 The Packers were stopped on 4th & 13rd & 4th downs · 66% expected +13% PHI GB: Turnover
8 Q4 1:59 Defensive Pass Interference on the Eagles (Johnathan Cyprien), 6 yardsJudgment calls · 0 flags in 59 snaps before, position avg 1 per 441 +7% GB GB: Turnover

Missing players

Key players (usually on the field for half the snaps or more) who missed this game or part of it, valued by position and quality. The same players are missing in every replay, so this counts as luck in points only.

  • Jason Spriggs (GB T), out (IR) · 0.4 pts
  • Lane Taylor (GB G), out (IR) · 0.3 pts
  • Raven Greene (GB FS), out (IR) · 0.2 pts
  • Ronald Darby (PHI CB), out · 0.5 pts
  • Cre'von LeBlanc (PHI CB), out (IR) · 0.5 pts

Adjust the assumptions

Disagree with how much of a fumble bounce or a pass interference call is luck? Change it and the coin-flip replay reruns in your browser.

Only coin-flips re-rolled

Eagles 99% · Packers 1%

Final margin
Eagles by 7
Luck in points
6.1 for the Packers
Luck-adjusted margin
Eagles by 13.1
Replay with same day's form
Eagles 84% · Packers 16% unchanged: why
How much of each is luck?

0% treats it as skill, 100% as pure luck. The tick is our fit.

What counts

We tested momentum on 19,000 lucky breaks and found none, so it's off by default. Why

Flip a play

Force the other outcome, in this game and in every replay: a made kick becomes a miss, a stop becomes a conversion, a flag goes the other way.

About these numbers

Play-by-play and win probability from nflfastR via nflverse; kicks valued against each kicker’s own record; drops and interception-worthy throws from FTN charting (not available for this game); injuries from snap counts and injury reports. No FTN charting for this game (drops and interception-worthy throws are not modelled).

Methodology and validation · All Week 4 2019 games · Eagles · Packers

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