Which teams are throwing the most to one receiver? Which teams are spreading it around the most? A good way to answer that is by using a Concentration Index. Let’s use Andrew Luck and the Indianapolis Colts as an example. Eric Ebron is the team’s leading receiver with 326 receiving yards, which represents 18.2% of the team’s total 1,796 receiving yards. To calculate a team’s concentration index in receiving yards, you need to square the percentage of receiving yards by each player, and sum the results. For example, 18.2% squared is 3.3%; do that for every player on Indianapolis and the total is 12.6%.
As it turns out, that’s the most diverse passing attack in the NFL. The most concentrated passing attack? That’s in Detroit:
The table below shows the concentration index for each team through six weeks, along with each team’s passing efficiency (as measured by ANY/A). Here’s how you read the top line. Detroit has the highest concentration index. The Lions have 1,404 receiving yards and have averaged 6.17 ANY/A, which ranks 20th in the NFL. Tate is the team’s leading receiver with 31% of the Lions receiving yards, and the team has a concentration index of 23%.
| CC Index | Team | Rec Yds | ANY/A | ANY/A Rk | Top Receiver | CC Index |
|---|---|---|---|---|---|---|
| 1 | DET | 1404 | 6.17 | 20 | Golden Tate (31%) | 23% |
| 2 | MIN | 1921 | 6.94 | 10 | Adam Thielen (37%) | 22.3% |
| 3 | LAR | 1928 | 9.1 | 3 | Robert Woods (27%) | 21.4% |
| 4 | ATL | 1975 | 8.3 | 6 | Julio Jones (36%) | 20.8% |
| 5 | TEN | 1043 | 4.54 | 29 | Corey Davis (37%) | 20.5% |
| 6 | ARI | 1026 | 3.46 | 31 | Christian Kirk (30%) | 19.5% |
| 7 | HOU | 1798 | 6.35 | 16 | DeAndre Hopkins (37%) | 19.4% |
| 8 | KAN | 1865 | 9.26 | 1 | Tyreek Hill (30%) | 19.2% |
| 9 | CIN | 1674 | 6.39 | 14 | A.J. Green (30%) | 19.2% |
| 10 | NYG | 1719 | 6.08 | 21 | Odell Beckham (29%) | 18.8% |
| 11 | TAM | 1896 | 8.74 | 5 | DeSean Jackson (26%) | 18.7% |
| 12 | PIT | 2033 | 7.2 | 8 | JuJu Smith-Schuster (28%) | 18.6% |
| 13 | CHI | 1261 | 7.06 | 9 | Taylor Gabriel (24%) | 18.4% |
| 14 | NOR | 1668 | 9.12 | 2 | Michael Thomas (31%) | 17.8% |
| 15 | LAC | 1710 | 8.95 | 4 | Keenan Allen (25%) | 16.8% |
| 16 | CAR | 1158 | 6.25 | 19 | Devin Funchess (27%) | 16.4% |
| 17 | DEN | 1687 | 5.64 | 26 | Emmanuel Sanders (30%) | 16.4% |
| 18 | NWE | 1599 | 6.93 | 11 | Rob Gronkowski (25%) | 15.5% |
| 19 | MIA | 1439 | 6.77 | 13 | Albert Wilson (25%) | 15.4% |
| 20 | GNB | 2052 | 7.26 | 7 | Davante Adams (27%) | 15.4% |
| 21 | PHI | 1663 | 6.28 | 17 | Zach Ertz (29%) | 15.3% |
| 22 | OAK | 1783 | 5.86 | 23 | Jared Cook (22%) | 15.2% |
| 23 | CLE | 1538 | 4.47 | 30 | Jarvis Landry (25%) | 15% |
| 24 | DAL | 1144 | 5.22 | 28 | Cole Beasley (26%) | 14.9% |
| 25 | JAX | 1675 | 5.68 | 25 | Dede Westbrook (23%) | 14.8% |
| 26 | NYJ | 1346 | 5.86 | 22 | Quincy Enunwa (21%) | 14.8% |
| 27 | BAL | 1812 | 6.27 | 18 | John Brown (23%) | 14.7% |
| 28 | SFO | 1610 | 5.81 | 24 | George Kittle (27%) | 14.3% |
| 29 | WAS | 1205 | 6.37 | 15 | Jordan Reed (19%) | 14% |
| 30 | SEA | 1308 | 6.86 | 12 | Tyler Lockett (28%) | 13.6% |
| 31 | BUF | 917 | 2.03 | 32 | Zay Jones (22%) | 12.6% |
| 32 | IND | 1796 | 5.61 | 27 | Eric Ebron (18%) | 12.6% |
If you sort by Adjusted Net Yards per Attempt, Philip Rivers and Drew Brees stand out having outstanding pass efficiency while also having diverse passing attacks.