EPA/NEPA attaches a point value to every play based on whether that play increases or decreases a team's expected point total. Plays with a positive NEPA are good for the team on offense, plays with a negative NEPA are bad.
That being said, good defenses should force a lot of negative NEPA plays and prevent positive NEPA plays. The chart below aggregates just that. For each defense I have listed the percent positive NEPA on run plays, pass plays, and total. - I want to emphasize that this is not the same thing as a negative play or a tackle for a loss. For example, 5 yards on 3rd and 12 would earn a team a negative NEPA because their expected point total would go down. A majority of plays are negative (even when Johnny Football has the ball), but there are more large and positive NEPA plays than negative (for the distributionally inclined, the distribution is positively skewed); the average play has a NEPA of 0.
Michigan State and Florida State can each boast that fewer than a third of plays against them were positive this season. Four teams from the SEC - Alabama, Florida, LSU and Vanderbilt - are in the top 15. Don't expect to see a lot of fireworks from Virginia Tech and Rutgers in the Russell Athletic Bowl; neither team is offensively gifted and they both have a penchant for hurting offenses.
The teams at the other end are bad, bad football teams. But at the very bottom is Navy, a significantly better team than UMass, New Mexico and their ilk. But Navy allowed 68% completions and 4.5 yards per carry - not a lot of negative NEPA play potential in those stats. That being said, their 53.5% positive NEPA play percentage is utterly terrible.
[-] About this table
Includes the
top 180 QBs by total plays
| Total <=0 | Percent of plays that are negative or no gain |
| Total >=10 | Percent of plays that gain 10 or more yards |
| Total >=25 | Percent of plays that gain 25 or more yards |
| 10 to 0 | Ratio of Total >=10 to Total <=0 |
Includes the
top 240 RBs by total plays
| Total <=0 | Percent of plays that are negative or no gain |
| Total >=10 | Percent of plays that gain 10 or more yards |
| Total >=25 | Percent of plays that gain 25 or more yards |
| 10 to 0 | Ratio of Total >=10 to Total <=0 |
Includes the
top 300 Receivers by total plays
| Total <=0 | Percent of plays that are negative or no gain |
| Total >=10 | Percent of plays that gain 10 or more yards |
| Total >=25 | Percent of plays that gain 25 or more yards |
| 10 to 0 | Ratio of Total >=10 to Total <=0 |
Includes
the
top 180 players by pass attempts)
| 3rdLComp% |
Completion % on 3rd and long (7+
yards) |
| SitComp% |
Standardized completion % for
down and distance. Completion % by down and distance are weighted by
the national average of pass plays by down and distance. |
| Pass <=0 | Percent of pass plays that are negative or no gain |
| Pass >=10 | Percent of pass plays that gain 10 or more yards |
| Pass >=25 | Percent of pass plays that gain 25 or more yards |
| 10 to 0 | Ratio of Pass >=10 to Pass<=0 |
| %Sacks |
Ratio of sacks to pass plays |
| Bad INTs |
Interceptions on 1st or 2nd down
early before the last minute of the half |
Includes the top 240 players by carries
| YPC1stD |
Yards per carry on 1st down |
| CPCs |
Conversions (1st down/TD) per
carry in short yardage situations - the team 3 or fewer yards for a 1st
down or touchdown |
| %Team Run |
Player's carries as a percent of team's carries |
| %Team RunS |
Player's carries as a percent of team's carries in short
yardage situations |
| Run <=0 |
Percent of running plays that
are negative or no gain |
| Run >=10 |
Percent of running plays that
gain 10 or more yards |
| Run >=25 | Percent of running plays that gain 25 or more yards |
| 10 to 0 | Ratio of Run >=10 to Run <=0 |
Includes the top 300 players by targets
| Conv/T 3rd | Conversions per target on 3rd Downs |
| Conv/T PZ | Touchdowns per target inside the 10 yardline |
| %Team PZ | Percent of team's targets inside the 10 yardline |
| Rec <=0 | Percent of targets that go for negative yards or no net gain |
| Rec >=10 | Percent of targets that go for 10+ yards |
| Rec >=25 | Percent of targets that go for 25+ yards |
| 10 to 0 | Ratio of Rec>=0 to Rec<=0 |
Includes the top 300 players by targets
| xxxx | xxxx |
...
Includes players with a significant number of attempts
| NEPA | "Net Expected Points Added": (expected points after play - expected points before play)-(opponent's expected points after play - opponent's expected points before play). Uses the expected points for the current possession and the opponent's next possession based on down, distance and spot |
| NEPA/PP | Average NEPA per play |
| Max/Min | Single game high and low |
Includes players with a significant number of attempts
| NEPA | "Net Expected Points Added": (expected points after play - expected points before play)-(opponent's expected points after play - opponent's expected points before play). Uses the expected points for the current possession and the opponent's next possession based on down, distance and spot |
| NEPA/PP | Average NEPA per play |
| Max/Min | Single game high and low |
| Adjusted | Reports the per game EPA adjusted for the strength of schedule. |
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