luckadjusted

Week 7 2020 · October 25, 2020

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

Lions at Falcons, Week 7 2020: who deserved to win?

The Lions beat the Falcons 23–22 and were the better team on the day: replayed with the same form, they win 8 of 10. The Falcons had the bounces: 3rd & 4th downs alone were worth 1.9 points to the Falcons.

An off day for the Falcons: they played far below what the matchup promised. In a fresh game against the Lions they would win 52% of the time; with this day’s form, 21%. The numbers

Before kickoff it was a pick’em. The biggest swing (Q4, 5:39 left): the Falcons were stopped on 3rd & 10, worth 52 points of win probability to the Lions.

Final

Detroit Lions 23
Atlanta Falcons 22

October 25, 2020 · Mercedes-Benz Stadium · Closing line: Falcons −1

Luck index +21 Lions about even · −21 Falcons

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. Lions win 8, Falcons win 2.

  1. 1 DET 37 ATL 10
  2. 2 DET 27 ATL 7
  3. 3 DET 36 ATL 20
  4. 4 DET 24 ATL 12
  5. 5 DET 26 ATL 17
  6. 6 DET 20 ATL 13
  7. 7 DET 17 ATL 13
  8. 8 DET 21 ATL 19
  9. 9 DET 30 ATL 33
  10. 10 DET 20 ATL 31

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 Falcons

They played far below what the matchup promised. In a fresh game against the Lions they would win 52% of the time; with this day’s form, 21%.

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

UnitThis gameUsual levelBetter or worse than usual
Lions offenseEPA per play gained +0.12 +0.09 better by 0.03
Lions defenseEPA per play allowed +0.16 +0.16 better by 0.00
Falcons offenseEPA per play gained +0.16 +0.11 better by 0.04
Falcons defenseEPA per play allowed +0.12 +0.16 better by 0.05

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

Lions win 79% of them, Falcons 21%, counting the 2% still level after regulation as half each. The line is what actually happened: Lions by 1.

Show as a table
Final margin in the replaysShare of replays
Lions by 17+27.9%
Lions by 9–1622.5%
Lions by 1–828.5%
Level after regulation2.1%
Falcons by 1–811.3%
Falcons by 9–165.8%
Falcons by 17+1.9%

Where the luck was

Take the luck out

The final margin was Lions by 1. Remove the luck, one kind at a time, and it becomes Lions by 1.3.

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. Prater, 50 yds made · 73% expected
  • M. Prater, 51 yds made · 72% expected
  • M. Prater, 46 yds missed · 80% expected
  • M. Prater, 49 yds made · 74% expected
Bar: expected chance of a make. Filled dot: made. Open dot: missed or blocked.

When it happened

Falcons’ chance of winning

As low as 0% and as high as 88%. 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 Falcons were ahead in it, below while the Lions were.
#WhenWhat happenedWin probability forNext drive
1 Q3 12:14 The Lions converted 3rd & 113rd & 4th downs · 27% expected +14% DET DET: Field goal
2 Q3 11:27 Offensive Holding on the Lions (Jesse James), 10 yards, wiping out the playJudgment calls · 2 flags in 843 snaps before, position avg 1 per 276 +16% ATL ATL: Punt
3 Q3 8:24 The Lions were stopped on 3rd & 53rd & 4th downs · 43% expected +13% ATL DET: Field goal
4 Q4 12:01 The Falcons were stopped on 4th & 53rd & 4th downs · 44% expected +13% DET ATL: Turnover
5 Q4 7:37 M. Prater missed 46-yard field goalKicks · 80% expected for him, 12 of 18 from 45+ before +27% ATL DET: Field goal
6 Q4 5:39 The Falcons were stopped on 3rd & 103rd & 4th downs · 31% expectedThe Falcons fumbled and the Lions recoveredFumble bounces · loose balls are close to 50/50 +52% DET ATL: Touchdown
7 Q4 1:18 The Falcons converted 3rd & 13rd & 4th downs · 76% expectedThe Falcons fumbled and recovered it themselvesFumble bounces · loose balls are close to 50/50 +35% ATL ATL: Touchdown
8 Q4 0:02 Unsportsmanlike Conduct on the Lions (Danny Amendola), 15 yardsJudgment calls · 2 flags in 834 snaps before, position avg 1 per 385 +12% ATL –

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.

  • Darqueze Dennard (ATL CB), out (IR) · 0.4 pts
  • Damontae Kazee (ATL SS), out (IR) · 0.3 pts
  • Damontae Kazee (ATL S), out (IR) · 0.3 pts
  • Desmond Trufant (DET CB), out · 0.6 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

Lions 58% · Falcons 42%

Final margin
Lions by 1
Luck in points
0.3 for the Falcons
Luck-adjusted margin
Lions by 1.3
Replay with same day's form
Lions 79% · Falcons 21% 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 7 2020 games · Lions · Falcons

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