National Football Post's Joe Fortenbaugh recently put together some rankings for NFL teams and their ability to 'take care of their business' at home. He used each team's home record from 2009-2011 (regular season) and their record against the Vegas spread to make his rankings. I'll let Fortenbaugh explain his scoring system, because at first glance it's a little confusing:
I've devised a rudimentary formula for these rankings that consists of both home field record and ATS (against the spread) record. The team that posted the best home field record since 2009 is awarded one point, while the organization with the worst record is awarded 32 points, and so on. If two teams had the same record and occupied spots No. 4 and No. 5 in the rankings, the difference was split and both teams were awarded 4.5 points. As I'm sure you could have already guessed, the goal is to have the fewest total points between the two categories.
Though it's obviously not a perfect way to measure the 'home-field advantage', it is an interesting look at team records at home, both straight up and against the spread. The Cardinals and their home field at the University of Phoenix Stadium came in 11th on the rankings system, meaning Arizona's ability to win at home is quite good as compared the majority of NFL teams. They've gone 14-10 at home since 2009 and 12-12 against the spread, just behind division rival Seattle and well ahead of perennially competitive teams like the Eagles, Cowboys and Giants.
You can talk more Cardinals over at Revenge of the Birds.