Yards per Attempt: Where Does it Go Wrong?

June 18, 2013 Passing

Yards per Attempt is the basic statistic around which the passing game should be measured. It forms the base of my favorite predictive statistic (Net Yards per Attempt) and my favorite explanatory statistic (Adjusted Net Yards per Attempt). But it’s not perfect. In theory, Yards per Attempt is a system-neutral metric. If you play in [...]

Read the full article →

What can we learn from Game Scripts splits?

June 9, 2013 Statgeekery

When I ask a question in the title of a post, I usually have an answer. But not this time. From 2000 to 2012, 163 different quarterbacks started 16 games. I thought it might be interesting to check out their splits based on the Game Script of each game. I grouped each quarterback’s statistics in [...]

Read the full article →

Another Note on the Relative Impact of Offense vs. Defense on Scoring

May 8, 2013 History

Last week, Chase had a great post where he looked at what percentage of the points scored by a team in any given game is a function of the team, and what percentage is a function of the opponent. The answer, according to Chase’s method, was 58 percent for the offense and 42 percent for [...]

Read the full article →

Scoring is 60% of the Game

May 2, 2013 Statgeekery

When the New England Patriots score 34 points in a game, that is the result of a couple of things: how good the Patriots are at scoring points and how good the Patriots’ opponent is at preventing points. As great as Tom Brady is, he’s not going to lead New England to the same number [...]

Read the full article →

How to determine the appropriate salary cap values for veterans: Part II

April 15, 2013 Statgeekery

In Part I, I derived a formula to translate the number of marginal wins a veteran player was worth into marginal salary cap dollars (my answer was $14.6M, but the Salary Cap Calculator lets you answer that question on your own terms). We can also translate Approximate Value into wins using a similar method. Each [...]

Read the full article →

D’Brickashaw Ferguson and how tackles age

April 10, 2013 Theory

A few weeks ago, I discussed why I selected D’Brickashaw Ferguson as my left tackle in the RSP Writer’s Project. In the comments to that post, mrh argued that tackles generally don’t age that well, a proposition I never really considered before. I have previously discussed quarterback age curves and examined running back aging patterns [...]

Read the full article →

Which positions are most consistent from year to year?

April 9, 2013 Strategy

Here’s the introduction to an old fantasy football article by my fellow Footballguys staffer Maurile Tremblay: In most fantasy football leagues, eligible players are divided into 6 different positions: quarterback, running back, wide receiver, tight end, placekicker, and special teams/defense. Imagine a league that includes a seventh position, team captain, which earns points each week [...]

Read the full article →

More thoughts on how many games a team of replacements would win

March 30, 2013 Statgeekery

Yesterday, I asked how many wins a team full of recent draft picks and replacement-level NFL players would fare. I don’t think there’s a right answer to the question, but it might be a more important question than you think (and you’ll see why on Monday). But I have at least one way we can [...]

Read the full article →

Thought Experiment: How many wins would this team average?

March 29, 2013 Theory

It’s been awhile, but time for another post in the Thought Experiments category. Assume the following: On May 1st, 2013, an average owner, average general manager and average coach are assigned an expansion team. They are randomly assigned 24 players: one from each of the seven rounds of the 2011, 2012, and 2013 drafts. So [...]

Read the full article →

The Time Value of Draft Picks

March 25, 2013 Draft

How do you compare the value of a draft pick this year compared to a draft pick next year? NFL teams have often used a “one round a year” formula, meaning a team would trade a 2nd, 3rd, or 4th round pick this year for a 1st, 2nd, or 3rd rounder next year. But to [...]

Read the full article →

How can teams best take advantage of the rookie salary cap?

March 18, 2013 Draft

[Special thanks goes out to my Footballguys.com co-writer Maurile Tremblay for his help in co-authoring this piece with me. Any points with which you may disagree are almost certainly due to my error, and not Maurile's.] The new NFL collective bargaining agreement that ended the 2011 lockout instituted some pretty big changes to the salary [...]

Read the full article →

Is good luck driving the low interception rates of Joe Flacco and Colin Kaepernick?

January 28, 2013 History

In September, I started a post by asking you to make this assumption: Assume that it is within a quarterback’s control as to whether or not he throws a completed pass on any given pass attempt. However, if he throws an incomplete pass, then he has no control over whether or not that pass is [...]

Read the full article →

Open thread: Will John Harbaugh’s success influence future head coach hires?

January 24, 2013 Coaches

When you think about the Ravens under John Harbaugh — or just about any time in their existence — you think of a defensive team. Under Ray Lewis, Ed Reed, Terrell Suggs, and Haloti Ngata, Baltimore has fielded dominant defenses for much of the last decade. Marvin Lewis, Baltimore’s defensive coordinator from 1996 to 2001, [...]

Read the full article →

Ray Rice is the newest star in What are the Odds of That?

January 11, 2013 Rushing

Regular readers surely recall my “What are the Odds of That” post from this summer. In that article, I referenced an obscured Jacoby Jones stat: in 2011, he gained three times as many receiving yards against teams at the back end of the alphabet as he did against the teams he faced in the front [...]

Read the full article →

Seattle’s HFA

December 27, 2012 Statistics

As usual, Aaron Schatz provided some interesting information in his weekly DVOA recap. He was looking into Seattle’s home/road splits, and found that the data support what you already know: [W]hen you look closer at home-field advantage over a period of several years, almost every team generally has the same home-field advantage, which in DVOA [...]

Read the full article →

Estimating NFL Win Probabilities for Matchups Between Teams of Various Records

October 30, 2012 Statgeekery

(I originally posted this at the S-R Blog, but I thought it would be very appropriate here as well.) WARNING: Math post. PFR user Brad emailed over the weekend with an interesting question: “Wondering if you’ve ever tracked or how it would be possible to find records vs. records statistics….for instance a 3-4 team vs. [...]

Read the full article →

Interceptions per Incompletion (or POPIP)

September 24, 2012 Passing

I leave the baseball analysis to my brothers at baseball-reference.com, but I know enough to be dangerous. There’s a stat called BABIP, which stands for Batting Average on Balls In Play. A “ball in play” is simply any at bat that doesn’t end in a home run or a strikeout. The thinking goes that luck [...]

Read the full article →

A thought experiment

September 22, 2012 Strategy

Yeah, yeah, Football Perspective turned 100 today, blah blah blah. I have something on my mind and I need the wisdom of this crowd. Below is a thought experiment. You are highly incentivized to correctly guess how many interceptions a quarterback threw in a specific game. If you can answer it correctly within the one-tenth [...]

Read the full article →

Are NFL Playoff Outcomes Getting More Random?

September 4, 2012 Statistics

[Today's post is brought to you by Neil Paine, my comrade at Pro-Football-Reference.com and expert on all things Sports-Reference related. You can follow Neil on twitter, @Neil_Paine.] Most fans like to think of the NFL’s playoff system as being the final word on each team’s season — run the table and you’re the champs, the [...]

Read the full article →

Ray Lewis and London Fletcher: incredible outliers or a signal of something more?

August 28, 2012 Defensive Players

In a year where offensive fireworks dominated the headlines, here’s a piece of trivia on the other side of the ball: 36-year-old London Fletcher led the league in tackles. Fletcher, like Ray Lewis, is past the point where he can be referred to by his name alone. Instead, both get the honorific “ageless” before their [...]

Read the full article →

Random Perspective On: The 2012 Tampa Bay Buccaneers

August 23, 2012 Coaches

Greg Schiano made an interesting comment the other day which went against conventional wisdom. “It’s a fine line between being a physical, aggressive football team and getting a flag. You gotta be careful. I don’t ever want to be the least penalized team in the league, because I don’t think you’re trying hard enough then…. [...]

Read the full article →