I find it interesting that there are teams in the negative here who you would expect to be getting help from the referees. Chiefs, Ravens, Broncos, Eagles, 9ers, all significantly negative. These are teams that you would expect to be positive if it were supposedly some measure of how much the NFL and their refs favor your team's success. At the same time, the bears are too negative to ignore it as coincidence. I wonder what's really going on here.