Wednesday, December 20, 2017

2017 NFL Game Predictions: Rest of Season, Playoffs, Best Team

 Welcome!  I intend this to be an ongoing project of predicting NFL game outcomes, point spreads, and final scores.  My hope is that my models will improve over time as they become more sophisticated and use better data.  I will try to regularly publish predictions to keep myself accountable, and will make observations along the way about what is working and what isn't.  See below for latest updates.  Enjoy!


  _________________________________________________________________________________

Welcome!  In years past I have predicted NFL scores and outcomes through the season and into the playoffs and Superbowl.  With work, school, and family life, this was not possible this year.  However, I managed to scrap together a little time to run the code to see what the rest of the season looked like.  With a few minor changes to the code, I was able to successfully run predictions for week 16, 17, the playoffs, Superbowl, and a "best" team prediction.  Given that I may not have time to revisit this, I lay out the predictions for the rest of the season below.

Week 16:
Not having followed much of the NFL this year, I am not sure I can really comment on the below games.  But from what little I know (a quick sanity check using win/loss comparisons), the below outcome predictions seem reasonable, although some of the probabilities strike me as a little strange.





Week
Date
Team
HomeAway
Opponent
ProbabilityWin
PredictedTeamWin
16
12/23/2017
Colts
@
Ravens
0.133
0
16
12/23/2017
Packers
Vikings
0.211
0
16
12/23/2017
Ravens
Colts
0.867
1
16
12/23/2017
Vikings
@
Packers
0.789
1
16
12/24/2017
49ers
Jaguars
0.406
0
16
12/24/2017
Bears
Browns
0.727
1
16
12/24/2017
Bengals
Lions
0.295
0
16
12/24/2017
Bills
@
Patriots
0.371
0
16
12/24/2017
Broncos
@
Redskins
0.257
0
16
12/24/2017
Browns
@
Bears
0.273
0
16
12/24/2017
Buccaneers
@
Panthers
0.075
0
16
12/24/2017
Cardinals
Giants
0.866
1
16
12/24/2017
Chargers
@
Jets
0.774
1
16
12/24/2017
Chiefs
Dolphins
0.628
1
16
12/24/2017
Cowboys
Seahawks
0.399
0
16
12/24/2017
Dolphins
@
Chiefs
0.372
0
16
12/24/2017
Falcons
@
Saints
0.447
0
16
12/24/2017
Giants
@
Cardinals
0.134
0
16
12/24/2017
Jaguars
@
49ers
0.594
1
16
12/24/2017
Jets
Chargers
0.226
0
16
12/24/2017
Lions
@
Bengals
0.705
1
16
12/24/2017
Panthers
Buccaneers
0.925
1
16
12/24/2017
Patriots
Bills
0.629
1
16
12/24/2017
Rams
@
Titans
0.581
1
16
12/24/2017
Redskins
Broncos
0.743
1
16
12/24/2017
Saints
Falcons
0.553
1
16
12/24/2017
Seahawks
@
Cowboys
0.601
1
16
12/24/2017
Titans
Rams
0.419
0
16
12/25/2017
Eagles
Raiders
0.813
1
16
12/25/2017
Raiders
@
Eagles
0.187
0
16
12/25/2017
Steelers
@
Texans
0.948
1
16
12/25/2017
Texans
Steelers
0.052
0

Week 16 Results:
  • Estimated: 11.743 (12) correct, so 4 incorrect
  • Actual: 14 - 2
    • Jaguars lost to the 49ers
    • Bengals beat the Lions
  • Comments
    • Seahawks may actually make it!  I have the Falcon's losing in week 17 and the Seahawks winning.  If both happen, Seahawks make the wildcard spot!
    • I have the Titans losing to the Jaguars, so they would go 8-8.  Chargers will beat the Raiders, so they will go 9-7.  Bills will beat the Dolphins so they will go 9-7.  Since the Chargers beat the Bills earlier this season, I'd now pick the Chargers to get into the playoffs over the Bills.
    • I'm a little shaken in my confidence in the Jaguars to be the team to win the Superbowl.  The 49ers are looking really good though and are a different team with Jimmy Garoppolo, having won 4 in a row since he became the starter.  So perhaps it is not the end of the world for my audacious predictions.
Week 17:
What about week 17?  Again, hard to comment since I haven't been following closely.  But the below again looks reasonable.
Week
Date
Team
HomeAway
Opponent
ProbabilityWin
PredictedTeamWin
17
12/31/2017
49ers
@
Rams
0.416
0
17
12/31/2017
Bears
@
Vikings
0.233
0
17
12/31/2017
Bengals
@
Ravens
0.375
0
17
12/31/2017
Bills
@
Dolphins
0.652
1
17
12/31/2017
Broncos
Chiefs
0.129
0
17
12/31/2017
Browns
@
Steelers
0.072
0
17
12/31/2017
Buccaneers
Saints
0.089
0
17
12/31/2017
Cardinals
@
Seahawks
0.259
0
17
12/31/2017
Chargers
Raiders
0.817
1
17
12/31/2017
Chiefs
@
Broncos
0.871
1
17
12/31/2017
Colts
Texans
0.473
0
17
12/31/2017
Cowboys
@
Eagles
0.338
0
17
12/31/2017
Dolphins
Bills
0.348
0
17
12/31/2017
Eagles
Cowboys
0.662
1
17
12/31/2017
Falcons
Panthers
0.419
0
17
12/31/2017
Giants
Redskins
0.093
0
17
12/31/2017
Jaguars
@
Titans
0.591
1
17
12/31/2017
Jets
@
Patriots
0.101
0
17
12/31/2017
Lions
Packers
0.737
1
17
12/31/2017
Packers
@
Lions
0.263
0
17
12/31/2017
Panthers
@
Falcons
0.581
1
17
12/31/2017
Patriots
Jets
0.899
1
17
12/31/2017
Raiders
@
Chargers
0.183
0
17
12/31/2017
Rams
49ers
0.584
1
17
12/31/2017
Ravens
Bengals
0.625
1
17
12/31/2017
Redskins
@
Giants
0.907
1
17
12/31/2017
Saints
@
Buccaneers
0.911
1
17
12/31/2017
Seahawks
Cardinals
0.741
1
17
12/31/2017
Steelers
Browns
0.928
1
17
12/31/2017
Texans
@
Colts
0.527
1
17
12/31/2017
Titans
Jaguars
0.409
0
17
12/31/2017
Vikings
Bears
0.767
1
Week 17 Results:
  • Estimated:  11.8 (so expected 12 correct, 4 incorrect)
  • Actual: 7-9
  • Comments
    • I really need to look at what happens when a team has secured a playoff spot and has nothing to gain by winning their last game.  It makes sense for a team in this position to not make an effort to win the last game, to rest their players, avoid injuries, and prepare for the playoffs.  Although I haven't watched the replays, I suspect this can help explain why the Eagles, Jaguars, Panthers, Rams, and Saints all lost.  Maybe next year I can adjust my model to account for this factor.
    • Falcons won and the Seahawks lost, so the Falcons made the playoffs after all.  The missed field goal at the end of the game is, in a way, a summary of the Seahawks entire season: at times, greatness, but too often, a miss.
    • In the AFC, the Ravens are out and the Titans are in the playoffs.  Bills made it in over the Chargers.  Lots of tie breaking rules at play here.  Four teams tied at 9-7: Titans, Ravens, Chargers, and Bills.  See here for how this tie breaking worked out.
    • In the NFC, all of the teams made it that I thought would, although the Rams are seeded at 3 and the Saints are seeded at 4.  Panthers, Saints, and Rams tied at 11-5.  The Rams beat the Saints earlier in the season so they go ahead of the Saints, and the Saints beat the Panthers, so they go ahead of the Panthers.
    • Playoff impact?
      • Titans vs. Chiefs - my model picks the Titans to win and the Chief's to lose.  Titan's will lose to Patriots, so that doesn't change.
      • Rams vs. Falcons-Rams beat Falcons and then play Vikings but lose to Vikings, so the Vikings continue.
      • Panthers vs. Saints - my model predicts a Panther's victory.  Panthers play the Eagles and lose, so the Eagles go on.
      • So while things are initially different, the ultimate outcome is not changed (based on my model from two weeks ago, which should probably be updated).

Playoffs and Superbowl


So what if the above is mostly correct?  Who will get into the playoffs?  My current predictions suggest the following by seed:
  • AFC - Patriots (1), Steelers (2),  Jaguars (3), Chiefs (4), Ravens (5), Bills (6)
    • Patriots beat the Steelers, so in an expected tie in record, Patriots get the first seed.
    • The Chiefs beat the Chargers twice, so in the case of a tie, they get the division. 
    • Ravens will likely go 10-6, so would have the top wildcard spot.
    • The Bills lost to the Chargers, so if they tie, the Chargers would go in ahead of them.  Neither of them has played the Titans. Bills have a slightly higher probability of winning, so I am giving them the 6th seed, although it could be the Chargers or Titans.
  • NFC - Eagles (1), Vikings (2), Saints (3), Rams (4), Panthers (5), Falcons (6)
    • Eagles will likely go 14-2 and get the top spot, with Vikings second.
    • Saints beat the Panthers twice and I expect will go 12-4 so I gave them the third seed.  I also expect the Panthers to go 12-4, but Saints would win in the tie break.
    • Rams should win the West and get the 4 seed.
    • Panthers then get the highest wildcard (5), and the Falcons get (6).
Sadly (at least for me), it looks like the Seahawks are out of the playoffs. But clearly, a lot can still change...
 
Team
Remaining Predicted Wins
Remaining Predicted Losses
Previous Wins
Previous Losses
Total Wins
Total Losses
Round Wins
Round Losses
Conference
Division
Rank Conference
Patriots
1.528
0.472
11
3
12.528
3.472
13
3
AFC
East
1
Steelers
1.876
0.124
11
3
12.876
3.124
13
3
AFC
North
2
Jaguars
1.185
0.815
10
4
11.185
4.815
11
5
AFC
South
3
Ravens
1.492
0.508
8
6
9.492
6.508
9
7
AFC
North
4
Chiefs
1.499
0.501
8
6
9.499
6.501
9
7
AFC
West
5
Bills
1.023
0.977
8
6
9.023
6.977
9
7
AFC
East
6
Titans
0.828
1.172
8
6
8.828
7.172
9
7
AFC
South
7
Chargers
1.591
0.409
7
7
8.591
7.409
9
7
AFC
West
8
Dolphins
0.72
1.28
6
8
6.72
9.28
7
9
AFC
East
9
Raiders
0.37
1.63
6
8
6.37
9.63
6
10
AFC
West
10
Bengals
0.67
1.33
5
9
5.67
10.33
6
10
AFC
North
11
Broncos
0.386
1.614
5
9
5.386
10.614
5
11
AFC
West
12
Jets
0.327
1.673
5
9
5.327
10.673
5
11
AFC
East
13
Texans
0.579
1.421
4
10
4.579
11.421
5
11
AFC
South
14
Colts
0.606
1.394
3
11
3.606
12.394
4
12
AFC
South
15
Browns
0.345
1.655
0
14
0.345
15.655
0
16
AFC
North
16
Eagles
1.475
0.525
12
2
13.475
2.525
13
3
NFC
East
1
Vikings
1.556
0.444
11
3
12.556
3.444
13
3
NFC
North
2
Saints
1.464
0.536
10
4
11.464
4.536
11
5
NFC
South
3
Panthers
1.506
0.494
10
4
11.506
4.494
12
4
NFC
South
4
Rams
1.165
0.835
10
4
11.165
4.835
11
5
NFC
West
5
Falcons
0.866
1.134
9
5
9.866
6.134
10
6
NFC
South
6
Seahawks
1.342
0.658
8
6
9.342
6.658
9
7
NFC
West
7
Lions
1.442
0.558
8
6
9.442
6.558
9
7
NFC
North
8
Cowboys
0.737
1.263
8
6
8.737
7.263
9
7
NFC
East
9
Packers
0.474
1.526
7
7
7.474
8.526
7
9
NFC
North
10
Redskins
1.65
0.35
6
8
7.65
8.35
8
8
NFC
East
11
Cardinals
1.125
0.875
6
8
7.125
8.875
7
9
NFC
West
12
Bears
0.96
1.04
4
10
4.96
11.04
5
11
NFC
North
13
49ers
0.822
1.178
4
10
4.822
11.178
5
11
NFC
West
14
Buccaneers
0.164
1.836
4
10
4.164
11.836
4
12
NFC
South
15
Giants
0.227
1.773
2
12
2.227
13.773
2
14
NFC
East
16

Suppose that the above playoff spot predictions are true.  Then what happens?  Using head to head predictions based on the season so far:
Wildcard:
Jaguars (3) vs. Bills (6) -> Jaguars (3) (0.569)
Chiefs (4) vs. Ravens (5) -> Ravens (5) (0.529)
Saints (3) vs. Falcons (6) -> Saints (3) (0.55)
Rams (4) vs. Panthers (5) -> Rams (4) (0.501)
Division:
Patriots (1) vs. Ravens (5) -> Patriots (1) (0.71)
Steelers (2) vs. Jaguars (3) -> Jaguars (3) (0.523)
Eagles (1) vs. Rams (4) -> Eagles (1) (0.501)
Vikings (2) vs. Saints (3) -> Vikings (2) (0.514)
Conference:
Patriots (1) vs. Jaguars (3) -> Jaguars (3) (0.542)
Eagles (1) vs. Vikings (2) -> Vikings (2) (0.501)
Superbowl:
Vikings (2) vs. Jaguars (3) -> Jaguars (3) (0.509)

Shocking!  The Jaguars will beat the Steelers, then the Patriots, before beating the Vikings in the Superbowl!  I should note that I originally had the Eagles going all the way and winning the Superbowl, but after factoring in injuries into my model, this was enough to push the Eagles out.  It's too bad Carson Wentz is injured, otherwise I would have the Eagles going all the way.

Best Team of 2017

If each team played every other team, who would come out on top?  If measured by total probability of wins, the Patriots, Vikings, and Steelers take 1, 2, and 3.  The Jaguars come in 4th.  The Eagles are down in 9th (before injuries, they were at 3).  The Giants, Texans, and Buccaneers, take 32,31, and 30.  If measured by total games won, then the Jaguars, Vikings, and Eagles take 1, 2, and 3, while the Giants, Colts, and Buccaneers take 32,31, and 30. The Patriots drop to number 7.
What does this mean?  In short, it means that the Patriots have the highest total probability of winning each game when they are predicted to win.  However, they are predicted to win fewer times than other teams.  As such, they are less consistent, prone to have a high probability of winning one week but then losing the next week by a narrow probability.  Meanwhile, for example, the Vikings are the only team to appear in both top three lists, meaning that they are expected to win with a fairly high probability when they are predicted to win AND predicted to win every game.  However, their total probabilities are lower than the Patriots, meaning that they are predicted to have closer victories than the Patriots, but more victories in total.

I should note that before factoring in injuries, the Eagles were my top choice.  But after injuries and the loss of their QB, their ranking has significantly fallen.
The Vikings appear in both lists at 2.  Jaguars are at 4 and 1.  Patriots are at 1 and 9.  Eagles are at 9 and 3.  Steelers are at 3 and 6.  Any of these teams has a claim at being considered the best team of the season.  Originally, I would have said the Eagles, as I had predicted them to win the Superbowl and they appeared in both top 3 lists.  After factoring in injuries, total probability of winning, and total games predicted to win, I am inclined to pick the Jaguars with the Vikings barely behind.  If the Jaguars can beat the Patriots, Steelers, and then beat the Vikings in the Superbowl as I have predicted, they will without a doubt be the best team of the year.  Thus, I conclude that the Jaguars are (or will be) the best team of the year.
Total Probability:
  

Rank
Team
Expected Value
1
Patriots
23.376
2
Vikings
22.234
3
Steelers
22.124
4
Jaguars
21.967
5
Panthers
21.914
6
Rams
21.623
7
Saints
21.236
8
Falcons
21.046
9
Eagles
20.896
10
Chargers
20.286
11
Lions
19.844
12
Seahawks
19.799
13
Bills
19.246
14
Titans
19.121
15
49ers
18.623
16
Ravens
18.326
17
Cowboys
17.831
18
Chiefs
17.524
19
Dolphins
15.069
20
Bengals
15.046
21
Packers
14.251
22
Redskins
14.011
23
Cardinals
13.375
24
Bears
13.13
25
Raiders
11.364
26
Jets
10.437
27
Broncos
8.201
28
Browns
6.772
29
Colts
6.725
30
Buccaneers
6.511
31
Texans
6.315
32
Giants
3.777

Total Wins:

Rank
Team
Total Wins
1
Jaguars
32
2
Vikings
31
3
Eagles
30
4
Rams
29
5
Panthers
28
6
Steelers
27
7
Patriots
26
8
Saints
25
9
Falcons
24
10
Chargers
23
11
Lions
22
12
Seahawks
21
13
Bills
20
14
Titans
19
15
49ers
18
16
Ravens
17
17
Cowboys
16
18
Chiefs
15
19
Dolphins
14
20
Bengals
13
21
Packers
12
22
Redskins
11
23
Cardinals
10
24
Bears
9
25
Raiders
8
26
Jets
7
27
Broncos
6
28
Texans
5
29
Browns
4
30
Buccaneers
3
31
Colts
2
32
Giants
1
Averages:
Team
AverageRank
AverageWins
Jaguars
2.5
26.9835
Vikings
2
26.617
Eagles
6
25.448
Rams
5
25.3115
Panthers
5
24.957
Patriots
4
24.688
Steelers
4.5
24.562
Saints
7.5
23.118
Falcons
8.5
22.523
Chargers
10
21.643
Lions
11
20.922
Seahawks
12
20.3995
Bills
13
19.623
Titans
14
19.0605
49ers
15
18.3115
Ravens
16
17.663
Cowboys
17
16.9155
Chiefs
18
16.262
Dolphins
19
14.5345
Bengals
20
14.023
Packers
21
13.1255
Redskins
22
12.5055
Cardinals
23
11.6875
Bears
24
11.065
Raiders
25
9.682
Jets
26
8.7185
Broncos
27
7.1005
Texans
29.5
5.6575
Browns
28.5
5.386
Buccaneers
30
4.7555
Colts
30
4.3625
Giants
32
2.3885

Conclusion

So there you have it.  If you haven't been paying attention all season, now having read this post, you can speak somewhat accurately about which teams are good, bad, and likely to make or do well in the playoffs.  Just make sure no one asks you why...
Good luck!

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