Armchair Analysis: small stats that yield big results

Cold, Hard Football Facts for Oct 02, 2009



(Ed. Note: It's come to our attention that some of our readers watch NFL games for reasons beyond just their viewing pleasure. So we teamed up this year with the guys from the amazing site ArmchairAnalysis.com. These guys basically study all the numbers that matter when it comes time to making a gentleman's wager, for pride only, of course, on NFL games. This is their first installment for CHFF.)
 
By Dennis Erny
 
One of the more interesting match-ups this weekend (for me anyway) involves Dallas (-3) at Denver – a game featuring a pre-season Super-Bowl favorite in the Cowboys who have under-whelmed so far this season versus an opponent that most would not have expected to be undefeated after three games, cream-puff schedule or not.
 
I've seen a lot of write-ups this week with the theme that Denver is due to come back to earth over the next few weeks and after looking at some of the statistics and trends surrounding this game, I would have to agree with this general assessment.
 
In particular, Denver's high Offensive Holding Penalty Against average (OHPA) of 1.67 per game is a concern as well as their extremely low average on Kick Return Yardage (only 17.6 yards per return).
 
Compare these numbers to Dallas' OHPA of only 1.0 per game and a decent KRYF of 21.3 and we have the basis for a powerful trend that has spelled doom for teams versus the number over the past 8 years, and Denver happens to fit all of its conditions going into this weekend.
 
The nuts and bolts of this situation were covered in a detailed article back in 2008, which continues below.
 
Original Article:
 
If there is one thing I have learned through the process of handicapping hundreds of NFL games over the past decade or so, and studying countless trends during this same time period, it's that the stats that are "off the beaten track" are usually the ones that produce the most profitable "stand-alone" trends.

The reason for this is actually fairly simple: Most of us know that Vegas sets the NFL line based predominantly on public perception of team strength. This is a point which even most novice handicappers are aware of these days. Sports books get their 10 percent 'Vig' regardless of who wins and losses and it's always been in their best interest to set lines that produce balanced action which helps to minimize their immediate risk and maximize long-term profits.

With the knowledge that the point spread is more a product of public sentiment, than actual team skill levels in many cases, it becomes fairly safe to assume that the statistics that help to shape public opinion will probably be less effective at handicapping the spread than other, equally effective stats that perhaps 'fly-below the radar' of the vast majority of handicappers out there.

This is not to say that basic statistics which focus on such things as the efficiency of a team's rushing and passing game are to be ignored. On the contrary, I use these fundamental measurements (expressed as yards-per-play differentials) as part of a number of my successful situations. But, a number of other conditions usually need to be added in order to make them truly effective in predicting spread winners.

Today we'll examine some overlooked stats that often reveal profits.
 
Teams that hold a lot lose a lot
Offensive Holding calls are the basis for a situation that has produced big profits over the past 7 years – a situation which has been highly effective even with only one Primary condition involved.

The condition I am speaking about is simple, and involves looking at teams that currently have a higher per-game average for Offensive Holding Penalties Against (OHPA) than their current opponent.

As an example, a team that has played 4 games and been flagged 9 times for Offensive Holding during this stretch, would have an OHPA of 2.25 (9/4) and would therefore be subject to this situation's logic when facing an opponent with an OHPA average of 2.24 or less.

As you might expect, teams with a higher OHPA have not been a good wager over the past eight seasons. You might be surprised; however, at just how badly they have fared.

  • Since 2001, teams with a higher OHPA have been a brutal 518-602 (46.3%) ATS when playing between Week 4 and 15, creating a profit of $3,220 at 10/11 odds with $110 wagers against the team in question.
Not bad for a relatively simple situation with one primary condition (OHPA > opponent OHPA) and a 'Secondary' stipulation (i.e., 'tightener') excluding games very early, and very late in the season.

Beyond the basic penalty yardage totals shown for each team in the final box score, the specific types and frequency of certain penalties that teams take are essentially ignored by 99.5 percent of handicappers, and for the reasons discussed above, these key stats will also not factor too much into the line as a result.

The importance of kick returns
Penalty calls are not the only facet of NFL team play that suffers from a lack of attention, despite their ability to reveal profitable situations versus the spread.

There happens to be quite a few other statistical gems that also fall into the 'overlooked' category and one such area concerns special teams play and more specifically, the king of this category — KRYF, which stands for Kick-off Return Yardage (Average) For.

KRYF is a critical stat that is on my "short list" of numbers that no good NFL handicapper should be with-out.

It acts as a barometer of overall special team's strength on the most important special teams play of all: the Kick-off return.

Kick-offs are a critical event because of their ability to switch a game's momentum in a heart-beat and they provide an opportunity for a team to quickly gobble up crucial yardage that can leave them with decent field position, which is key to any chance of a victory, whether it be SU or ATS.

Nothing deflates a team that just finished putting points on the board more, than an opponent who runs back the ensuing kick-off for 40 yards and we all know the affect that a player like Chicago's kick-return specialist, Devin Hester, can have on a game's outcome in the blink of an eye.

The league average for KRYF is usually around 22 yards-per-return. Good teams will find themselves with an average near 25 while lousy return teams will be down near 19 yards-per-return.

KYRF is a stat that I use a lot, and it just happens to be the basis for one of the 2 remaining Primary conditions yet to be discussed. Including the original one involving OHPA, this powerful 'trifecta' of negative factors spells doom for the team unlucky enough to meet all of the criteria involved.

Here is how KRYF factors into things:
  • I have found that teams that have a higher OHPA as well as a lower KRYF than their current opponent, have been a dismal 245-332 (42.5%) ATS since 2001, which almost doubles the profit produced from looking at OHPA alone, to $6,250.
As with OHPA, it makes sense that teams at a disadvantage with regards to KRYF are a poor bet against the spread. The surprise here, once again, is just how profitable it has been historically, when betting against this team based on these 2 simple factors alone.
 
Punting matters, too
Now, we are not done quite yet. The final significant stipulation that I like to add also involves special teams – in this case a comparison of Gross Punt Yardage and Net Punt Yardage concerning the current opponent of the team in question is included.

Subtracting Net Punt Yardage (the yardage achieved by a punt after the return is factored in along with any penalties against the punting team) from Gross Punt Yards (the distance a punt actually travelled from where the ball was snapped) is an excellent way to look at the ability of a team to:
  1. Execute a punt properly, and
  2. Efficiently cover the ensuing return

Teams with a poor punt coverage unit or that take a higher-than-average number of penalties during the punt itself; will see a wider gap between their GPYF and NPYF. Teams that have a below-average punter will also have a lower NPYF by extension, as shorter punts do carry a higher risk of big returns if coverage personnel do not have enough time to get into proper position.

The average gap between a team's GPYF and their NPYF happens to be 6 yards. By excluding opponents that have a GPYF at least 7 yards higher than their NPYF, we effectively remove opponents that have either poor coverage skills on punts, or a weak punter. Ultimately, this is yet another blow against the team already stinging from the other factors previously discussed. (Currently, Dallas has a GPYF of 46.2 compared with a NPYF of 40.8 — a difference of only 5.4 yards).

In summary then:

  • Teams that have a higher per-game average for Offensive Holding Penalties Against (OHPA) along with a lower per-game average for Kick-off Return Yardage For (KRYF) are 142-244 (36.8%) ATS since 2001, so long as this opponent's Gross Punt Yardage figure is no more than 7 yards bigger than their Net Punt Yardage per-game average.
Based on these three primary conditions (along with the earlier tightener that confines things to Week 4 thru 15), we have a trend that has been a consistent winner since '01 and has produced a profit of $8,780 at 10/11 odds during this time period.

Rounding things out, are three final limitations, one of which excludes teams who have faced a tough schedule season-to-date (SOS > 0.600) while another excludes underdogs of >= 7 points. Also, the team in question should not be coming off a game versus last season's Super-Bowl winner nor facing the past SBW in their next game.

With the addition of these final 3 conditions, the record is reduced to 92-205 (31.0%) ATS — a killer situation that has been a deadly predictor of results ATS for eight years running.

A brief look at the stats below will show that this is a very balanced trend that has played on every single team in the league, aside from one. And, it is split fairly evenly between favs and dogs as well as home and away teams.

Here are all the details.

(Notes: ASMR stands for Average Spread Margin Rating. A positive rating indicates a trend that is stronger than average versus the line, negative — weaker than average. TDIS% is the percentage of teams in the league that have been involved in this situation at one time or another. WT% is the percentage of teams that are .500 or better and SPR is the average spread for teams in this situation. For more details, please consult Page 18 of my 2008 NFL Game Reports Guide.)

Situational Trend Summary
Primary Conditions (Building Blocks)
1) Offensive Holding Penalty Average Against (OHPA) > Opponent.
2) Kick-off Return Yardage Average For (KRYF) <= Opponent.
3) Opponent's Gross Punt Yardage Average (GPYF) is within 7 yards of their Net Punt Average (NPYF).

Secondary Conditions (Tighteners)
1) Game is between Week 4 and 15.
2) Team is not an Underdog of >=7 Points.
3) Strength of Schedule (SOS), season-to-date, is <= .600.
4) Team is not coming off, nor coming up, on a game with last season's Super Bowl Winner (SBW).

Situation Stats
ASMR: -0.3
Home%: 58
Dog%: 43
TDIS%: 100
WT%: 59
SPR: -1.3
Top Teams: MIN(20); BUF(15); NYG(15); PIT(15); ARI(14)

Situation Record
Overall (Since '01): 92-205 ATS
2008 Season: 18-22 ATS
2007 Season: 10-24 ATS
2006 Season: 8-23 ATS
2005 Season: 11-34 ATS
2004 Season: 13-30 ATS

From our partners




Team Pages
AFC East NFC
South
North
West

Connect With Us
Sign up for our newsletter to recieve all the latest news and updates...
Privacy guaranteed. We'll never share your info.




The Football Nation Network

© Copyright 2014 Football Nation LLC. Privacy Policy & Terms of Use
Some images property of Getty Images or Icon/SMI