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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 IndexTeamRec YdsANY/AANY/A RkTop ReceiverCC Index
1DET14046.1720Golden Tate (31%)23%
2MIN19216.9410Adam Thielen (37%)22.3%
3LAR19289.13Robert Woods (27%)21.4%
4ATL19758.36Julio Jones (36%)20.8%
5TEN10434.5429Corey Davis (37%)20.5%
6ARI10263.4631Christian Kirk (30%)19.5%
7HOU17986.3516DeAndre Hopkins (37%)19.4%
8KAN18659.261Tyreek Hill (30%)19.2%
9CIN16746.3914A.J. Green (30%)19.2%
10NYG17196.0821Odell Beckham (29%)18.8%
11TAM18968.745DeSean Jackson (26%)18.7%
12PIT20337.28JuJu Smith-Schuster (28%)18.6%
13CHI12617.069Taylor Gabriel (24%)18.4%
14NOR16689.122Michael Thomas (31%)17.8%
15LAC17108.954Keenan Allen (25%)16.8%
16CAR11586.2519Devin Funchess (27%)16.4%
17DEN16875.6426Emmanuel Sanders (30%)16.4%
18NWE15996.9311Rob Gronkowski (25%)15.5%
19MIA14396.7713Albert Wilson (25%)15.4%
20GNB20527.267Davante Adams (27%)15.4%
21PHI16636.2817Zach Ertz (29%)15.3%
22OAK17835.8623Jared Cook (22%)15.2%
23CLE15384.4730Jarvis Landry (25%)15%
24DAL11445.2228Cole Beasley (26%)14.9%
25JAX16755.6825Dede Westbrook (23%)14.8%
26NYJ13465.8622Quincy Enunwa (21%)14.8%
27BAL18126.2718John Brown (23%)14.7%
28SFO16105.8124George Kittle (27%)14.3%
29WAS12056.3715Jordan Reed (19%)14%
30SEA13086.8612Tyler Lockett (28%)13.6%
31BUF9172.0332Zay Jones (22%)12.6%
32IND17965.6127Eric 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.

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