The seven categories measured are:
Adjusted Points (20 percent) -- Total Points Scored or Allowed minus Points on Returns and Safeties.
Turnovers (20 percent).
Red Zone Efficiency (20 percent) -- Measured by Percent of Possible Points (figured by taking the number of Red Zone Chances times 7, then dividing it by the number of Points Actually Scored (defined as TDs times 7 plus FGs times 3).
Yards Per Play -- Divided into Yards Per Rush (10 percent of total) and Yards Per Pass Play (10 percent of total). Yards Per Pass Play includes yards on plays involving sacks.
First Down Achievement -- Divided into Total First Downs (10 percent of total) and 3rd Down Conversion Percentage (10 percent of total).
Maybe someone could figure out the exact formula with this information.