We're almost a week away from NFL free agency. So while teams do not currently have the power to acquire new talent on the field, they have just finished constructing the coaching staffs that will eventually take the incoming and assembled talent and turn it into value.
PFF grades every player on every play of each game, and we can use these grades to find out how much surplus value a coach is adding by taking the difference in expected points that are actually gained or allowed from what is expected. Clustering methods are used to downweigh or throw out “noisy” plays before we arrive at our final play-caller metric, which is used in our fantasy and gambling models.