Nuke. Yards a game is no good. Yards a play is closer. Ppd is best.
Yards a play:
2016 - 77
2015 - 92
2014 - 110
2013 - 78
Feel free to discuss if you think thats awful. I DO. No reason we cant be top 40 in this stat. We arent close. And this goes back to his loose scheme giving up too many yards a snap.
@AE 87 may have ppd numbers
This is where evaluating defenses gets very complicated. Some things to consider:
1. Is the avg yards per play between rank 78 & 110 statistically significantly different? (I assume not)
2. How do you adjust for quality of opposing offense?
3. Sacks & TFL are important and aren't fully captured by yards per play. Better to lose yardage 20% of the time and gain 6 y/play 80% of the time than to gain 4.8 yards/play 100% of the time.
4. Explosion plays are important and aren't fully captured by yards per play.
5. Turnovers have even more impact.
6. Forcing FG instead of TD is perhaps more important than not letting someone in FG range.
Etc.
But the real kicker here is that there is a whole lot of variance in these things, esp. with something like turnovers which has enormous impact but happens infrequently. Thus, a defense might be much more successful based on randomness (common cause variation).
The problem with approaching addressing these things is that our coaches aren't engineers. They are going to react to what they see, and if they fiddle too much they're causing problems rather than fixing them. We might be reacting to random variation rather than something real.
This is exceedingly difficult to measure as we are doing a different job every game (different opponent, different scheme, different conditions), so we'll have to be a little more qualitative. Focus:
1. Make sure we are doing standard work. More important that everyone knows what job to do and how to do it than that the job is being done right.
2. When looking at breakdowns, try to understand if we have special cause variation or common cause variation. In football defense, special cause variation might be things like (good - we figured out snap count, we recognized play so forced a pick) and (bad - our scheme doesn't account for the wheel route). We need to have a plan to address special causes we can identify.
3. We need to identify our causes of failure and cluster them and identify the process weaknesses we have (not structural - e.g. need someone bigger or faster, etc.)
4. We need to go away from the idea of solutions being finding the best player at some position/training our players to "be more consistent", etc. What we end up doing there is "chasing the tail". That is, our work is probably producing results (individually, like time to recognize play action) that are a predictable distribution, such as normal. By the first approach, we're trying to cut off the chances of having a slow time to react. That's great, but it only moves the median by a tiny bit.
5. Instead, we should focus on process of how we account for play action in a given formation, how we are being trained to recognize it, how effective is that training producing results (and why? -- unclear instructions, process takes too much time, relies on communication which is not reliable, outside of our player's capability so do something else, etc.)