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Defense Analyzer - Week 4

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Defense Analyzer - Week 4

Postby prince_45243 » Tue Sep 27, 2011 10:07 am

Prince's Defense Analyzer - How it's calculated:

Hello all, reviving this column after a year off. Several years ago, I figured out that a defense that allows fewer points is great in real life but really a terrible predictor of how good they are fantasy wise. Same thing goes with being good as a rushing or passing defense. Great at stopping opponents, but not necessarily predictive of fantasy production. The analysis I did was in 2007-2009 and I stopped doing them after that because the results were always the same. The figures are summarized below.

The figure below shows the Points Against (y-axis) versus the average fantasy points produced by the team (average is right around 6.5 points per game). The 'correlation' is only 0.25 (1 is perfect correlation and 0 is absolutely no correlation).
Image

The figure below shows a combination of turnovers and sacks (y-axis) compared to the average fantasy production of the team (x-axis). As you can see, there may be an outlier or two but basically, calculating the turnover and sacks that the team produces highly correlates with the DST fantasy output of the team in question. The r-squared is 0.73 which statistically is excellent!

Image

For the record, turnovers alone had a correlation of 0.59 and sacks had a correlation of 0.30.
I analyzed all different combinations of data including touchdowns, safeties, etcetera and could not improve upon the correlation of 0.73 and all other additional information only reduced the predictive power of the analysis.

So basically, a team that is good at creating turnovers and sacks are more likely to have touchdowns and other things happen and their score is more likely to be better. A team that gives up tons of turnovers and sacks will also be a nice matchup for the defense.

The defense analyzer then looks at each week's matchup, uses updated NFL.com statistics to determine the average weighted value of turnovers and sacks for the defense and their match-up offense and then I sort to provide the list.

In the future, I'll just link to this post rather than continuously posting how the analyzer works.

Thanks,
Prince
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Re: Defense Analyzer - Week 4

Postby prince_45243 » Tue Sep 27, 2011 10:17 am

The following shows the rank, the defending team, their matchup for the week, their average points per week from turnovers and sacks, the matchups average points given up per week for turnovers and sacks and then the sum of those to values in the last column. As described previously, any team may look great if they have a defense or special teams TD but the only predictor of those are increased turnovers and sacks and are otherwise very hard to predict.

Team TO/S Total
1 SDF PHI 7.67 8.33 16.00
2 BAL NYJ 7.67 6.33 14.00
3 ATL SEA 6.33 6.67 13.00
4 CAR CHI 5.67 7.33 13.00
5 DAL DET 7.00 5.67 12.67
6 DET DAL 6.00 6.67 12.67
7 GB DEN 7.33 5.33 12.67
8 NO JAX 4.00 8.67 12.67
9 NYG ARI 7.33 5.33 12.67
10 PHI SDF 6.00 6.33 12.33
11 HOU PIT 5.67 6.33 12.00
12 WAS STL 5.33 6.67 12.00
13 SD MIA 3.00 8.33 11.33
14 SEA ATL 3.67 7.67 11.33
15 CHI CAR 6.00 5.33 11.33
16 MIN KC 5.00 5.67 10.67
17 ARI NYG 5.67 4.67 10.33
18 IND TB 5.67 4.67 10.33
19 NYJ BAL 5.67 4.67 10.33
20 OAK NE 6.00 4.33 10.33
21 BUF CIN 6.00 3.67 9.67
22 TEN CLE 6.00 3.67 9.67
23 MIA SD 2.67 6.67 9.33
24 TB IND 6.00 3.33 9.33
25 CIN BUF 5.00 4.00 9.00
26 CLE TEN 6.33 2.67 9.00
27 KC MIN 5.00 4.00 9.00
28 NE OAK 6.67 2.00 8.67
29 STL WAS 4.00 4.67 8.67
30 JAX NO 3.00 4.00 7.00
31 PIT HOU 2.33 4.67 7.00
32 DEN GB 1.67 3.00 4.67

(SDF = San Francisco)
SF is getting close to 8 points per game from turnovers and sacks and Phillie is giving up 8 points per game in turnovers and sacks. This is a nice matchup for SF. Pittsburgh, unfortunately, has gained only 2 points per game in turnovers and sacks and Houston has been giving up only 4.7 points per game in turnovers and sacks. Slight caveat on NO as a defense, while they have a nice matchup, they haven't so far actually produced that many turnovers and sacks. Another caveat for Dallas who has the vast majority of their points in sacks of which Detroit yields very little.

This data contains only 3 weeks of data and the analyzer works better as the season goes on. I highly recommend not quibbling over a point or two here or there but look at major differences only.

Good luck and hope this helps.
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Re: Defense Analyzer - Week 4

Postby prince_45243 » Tue Sep 27, 2011 10:29 am

The NFL ranks rushing and passing defense based on yards per game. However, from a fantasy perspective, TDs and turnovers are weighted much more than yards are. Thus I created this 'fantasy' defense outlook.

The following is based on 1 point per 25 yards passing, 6 per TD, -2 per turnover. It is listed as fantasy rank, team, NFL rank, score and tough. Score is the average number of points the team is giving up to opposing passers. Tough is how tough a schedule they've had so far this year (what their opponents passing strength is). For example, the NYJ are my top passing defense. Opposing qbs have averaged only 8.2 points per game against them and they have faced the 12th toughest schedule. The NFL ranks the jets as 6th in passing defense based on yards per game only.

Detroit is ranked second on my list and opposing qbs are only averaging 8.9 ppg against them, but they've had the easiest schedule so far this year from passing output (TB, KC and MIN). Washington is truly a great passing defense but are only ranked 15th according to the NFL. But having faced the 6th toughest schedule so far, they have only allowed an average of 11.6 ppg.
PASSING:
TeamRank Scoretough
1 NYJ 6 8.2 12
2 DET 4 8.9 32
3 TEN 2 10.2 13
4 SDF 10 11.4 24
5 WAS 15 11.6 6
6 BAL 17 12.5 11
7 PIT 1 12.6 27
8 IND 18 14.1 23
9 CLE 3 14.2 2
10 NYG 20 14.2 8
11 CIN 5 14.9 26
12 ATL 22 15.8 17
13 JAX 7 15.9 20
14 ARI 25 16.3 7
15 SEA 16 16.4 15
16 HOU 11 17.1 4
17 DAL 12 17.1 18
18 TB 23 17.5 31
19 SD 9 18.8 29
20 CAR 14 18.9 21
21 DEN 13 19.4 10
22 MIN 29 20.0 25
23 BUF 24 20.9 3
24 OAK 28 21.6 16
25 CHI 26 21.8 9
26 PHI 8 22.6 5
27 GB 31 23.0 14
28 STL 19 23.4 22
29 KC 21 23.7 1
30 NE 32 23.7 30
31 NO 27 24.6 19
32 MIA 30 27.1 28

The idea here is if you're between two QBs of relatively equal skill but one is facing an opponent the WAS (15th by NFL, 5th by mine) and the other is facing CAR (14th by NFL but 20th by mine), I would take the one facing CAR. I would typically caution everyone that conventional wisdom says to play the player first, matchup second, all other factors third.

RUSHING
Based on 1 point per 10 yards, 6 per TD, -2 per fumble. SDF=San Francisco. SF has been the toughest team to rush against all year but they've also had the easiest schedule so far facing only SEA, DAL and CIN. Although my highest rank by performance, I would say they are suspect so far. Most of the top 10 teams have had relatively light schedules. The Jets are surprisingly at the bottom of this list and I think undeservedly so. One 70 yd TD run from DMC can really mess with a 3 game statistical curve.

TeamRank Scoretough
1 SDF 13 4.3 32
2 GB 1 6.8 30
3 DAL 2 7.5 23
4 CHI 18 8.9 17
5 BAL 6 9.1 31
6 TEN 8 9.6 24
7 JAX 5 10.4 29
8 CIN 7 11.5 28
9 NYG 15 11.7 8
10 DEN 14 12.0 3
11 CAR 25 12.4 13
12 MIA 16 12.5 11
13 DET 21 12.6 6
14 MIN 4 12.7 15
15 TB 23 12.7 14
16 NO 9 13.1 18
17 SD 19 13.1 7
18 HOU 17 13.2 21
19 CLE 29 13.5 25
20 NE 10 13.8 4
21 PIT 12 13.9 27
22 WAS 11 15.1 20
23 ATL 20 15.2 12
24 SEA 3 15.3 22
25 BUF 24 16.2 1
26 ARI 27 16.3 26
27 PHI 30 16.5 19
28 IND 22 17.3 16
29 OAK 26 17.4 9
30 STL 32 20.8 5
31 KC 28 21.0 10
32 NYJ 31 23.7 2

Please remember that this is total points given to opposing rushers which may be split among several rushers (including the QB).
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Re: Defense Analyzer - Week 4

Postby Chicago 2 » Tue Sep 27, 2011 12:32 pm

This is very helpful, thanks.

Was debating which defense to play this week and I'm liking the giants given this information, especially if Beanie Wells doesn't play.
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Re: Defense Analyzer - Week 4

Postby ramble2 » Tue Sep 27, 2011 1:30 pm

Brilliant stuff. Thanks for sharing it. ;-D
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Re: Defense Analyzer - Week 4

Postby FatFoot » Tue Sep 27, 2011 2:30 pm

Very interesting. This stuff is always money by the half-way point, as there are always the freak occurrences... a mediocre defense gets a crazy number of turnovers etc. It takes a while for those numbers to taper back down to reality. But I have personally never gone beyond knowing that a defense has a good statistical matchup... I've never done any calculations based on sacks, turnovers, etc. In retrospect it seems pretty obvious, but it wouldn't, had you not turned on the lightbulb.
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Re: Defense Analyzer - Week 4

Postby HotHandz305 » Wed Sep 28, 2011 7:30 am

I initially thought the Giants would be the best play regardless of Wells but was really tempted to go with Atlanta vs Sea, not sure now.
Week 13 Roster
QB Tony Romo
WR1 Greg Jennings
WR2 Vincent Jax
RB1 Arian Foster
RB2 LeSean McCoy
TE Vernon Davis
Flex (W/R/T) Willis McGahee
K Billy Cundiff
DST GB
IDP Patrick Willis
BEN Roy Helu
BEN Fred Davis
BEN Stevie Johnson
BEN Pitt D/ST
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Re: Defense Analyzer - Week 4

Postby eaglesfan » Wed Sep 28, 2011 9:28 am

Had SF last week...thought NO would be a top 3 play...might go back to SF :-o
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Lineup:
E. Manning - T. Romo
W. Welker - R. Cobb - H. Nicks
M. Forte - D. Sproles - CJ Spiller - S. Ridley
J. Finley - K. Rudolph
M. Bryant
Arizona - Green Bay
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Re: Defense Analyzer - Week 4

Postby Chicago 2 » Wed Sep 28, 2011 9:31 am

HotHandz305 wrote:I initially thought the Giants would be the best play regardless of Wells but was really tempted to go with Atlanta vs Sea, not sure now.

I'm going with the Giants, still somewhat tempted to go with Tampa Bay or New Orleans.
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Re: Defense Analyzer - Week 4

Postby HotHandz305 » Thu Sep 29, 2011 11:44 am

How is the toughest schedule "score tough" determined because something doesn't seem right..

Cleveland is on the list there as 2nd toughest for "scoretough" yet they played the Bengals, Colts, and Dolphins.. Hardly what to me would entail the 2nd toughest schedule?

Then it has New England listed as 30th hardest with match ups agaisnt Dolphins, Chargers, Bills which seems much harder the prior mentioned..
Week 13 Roster
QB Tony Romo
WR1 Greg Jennings
WR2 Vincent Jax
RB1 Arian Foster
RB2 LeSean McCoy
TE Vernon Davis
Flex (W/R/T) Willis McGahee
K Billy Cundiff
DST GB
IDP Patrick Willis
BEN Roy Helu
BEN Fred Davis
BEN Stevie Johnson
BEN Pitt D/ST
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