Football Outsiders is one of my favorite sites to go to for hard, objective advanced statistics. I often cite their DVOA metric, which measures a team’s efficiency on a down-by-down basis, adjusting for the strength of the opponent, much like I do with my On Paper previews.
Another favorite statistic they invented is “Adjusted Games Lost.” Football Outsiders uses this metric to try and quantify the injury impact that a team dealt with throughout an entire season. Rather than just adding up the games lost due to injury for an entire team, they have a more complicated process that weighs the impact of injured starters more and also factors in players who played, but weren’t at 100 percent (taking into account injury reports).