luckadjusted

Week 2 2019 · September 15, 2019

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

Vikings at Packers, Week 2 2019: who deserved to win?

The Packers beat the Vikings 21–16, but it was a coin flip: replayed with the way both teams played, the Packers win 6 of 10. Luck ran their way: judgment calls alone were worth 9.1 points to the Packers.

Before kickoff the Packers were 59% favorites. The biggest swing (Q3, 9:19 left): the Vikings converted 3rd & 13, worth 11 points of win probability to the Vikings.

Final

Minnesota Vikings 16
Green Bay Packers 21

September 15, 2019 · Lambeau Field · Closing line: Packers −3

Luck index +40 Packers lucky · −40 Vikings

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. Vikings win 4, Packers win 6.

  1. 1 MIN 37 GB 10
  2. 2 MIN 40 GB 23
  3. 3 MIN 34 GB 26
  4. 4 MIN 29 GB 26
  5. 5 MIN 41 GB 43
  6. 6 MIN 28 GB 33
  7. 7 MIN 24 GB 33
  8. 8 MIN 9 GB 23
  9. 9 MIN 30 GB 48
  10. 10 MIN 13 GB 39

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.

How 4,000 replays ended

Vikings win 40% of them, Packers 60%, counting the 3% still level after regulation as half each. The line is what actually happened: Packers by 5.

Show as a table
Final margin in the replaysShare of replays
Vikings by 17+10.7%
Vikings by 9–1612.0%
Vikings by 1–817.5%
Level after regulation2.6%
Packers by 1–821.2%
Packers by 9–1615.3%
Packers by 17+20.7%

Where the luck was

Take the luck out

The final margin was Packers by 5. Remove the luck, one kind at a time, and it becomes Vikings by 4.5.

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.

  • D. Bailey, 47 yds missed · 77% expected
  • D. Bailey, 31 yds made · 96% expected
  • Extra point missed · 70% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Packers’ chance of winning

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 Vikings were.
#WhenWhat happenedWin probability forNext drive
1 Q1 9:21 D. Bailey missed 47-yard field goalKicks · 77% expected for him, 0 of 0 from 45+ before +9% GB MIN: Turnover
2 Q1 1:55 The Vikings converted 3rd & 73rd & 4th downs · 33% expectedThe Vikings fumbled and recovered it themselvesFumble bounces · loose balls are close to 50/50 +7% MIN MIN: Turnover
3 Q2 1:12 Offensive Pass Interference on the Vikings (Dalvin Cook), 10 yards, wiping out the playJudgment calls · 0 flags in 36 snaps before, position avg 1 per 654 +6% GB GB: Punt
4 Q3 10:17 The Packers were stopped on 3rd & 83rd & 4th downs · 31% expectedThe Packers fumbled and the Vikings recoveredFumble bounces · loose balls are close to 50/50 +7% MIN GB: Punt
5 Q3 9:19 The Vikings converted 3rd & 133rd & 4th downs · 22% expectedUnsportsmanlike Conduct on the Vikings (Stefon Diggs), 15 yardsJudgment calls · 0 flags in 32 snaps before, position avg 1 per 331 +11% MIN MIN: Touchdown
6 Q3 4:49 The Vikings converted 3rd & 43rd & 4th downs · 44% expected +8% MIN MIN: Punt
7 Q4 15:00 The Packers were stopped on 3rd & 63rd & 4th downs · 36% expected +7% MIN GB: Punt
8 Q4 14:52 The Vikings fumbled and recovered it themselvesFumble bounces · loose balls are close to 50/50Offensive Holding on the Vikings (Kris Boyd), 10 yardsJudgment calls · 2 flags in 27 snaps before, position avg 1 per 199 +6% MIN MIN: Punt

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) · 0.3 pts
  • Equanimeous St. Brown (GB WR), out (IR) · 0.3 pts
  • Pat Elflein (MIN C), out · 0.5 pts
  • Mackensie Alexander (MIN CB), out · 0.2 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

Vikings 70% · Packers 30%

Final margin
Packers by 5
Luck in points
9.5 for the Packers
Luck-adjusted margin
Vikings by 4.5
Replay with same day's form
Vikings 40% · Packers 60% 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 2 2019 games · Vikings · Packers

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