The matchup page for two nfl teams shows yards per point and calculates a differential between offense and defense.

the differential is calculated as offense yards per play minus defense yards per play.

this is inaccurate and could be misleading for those new to this stat or betting.

obviously, if you have few yards per point on offense(good) and many yards per point on defense(good), you shouldn't have a negative differential

http://www.sportsbookreview.com/nfl-.../20141012-254/

In this example, the steelers are +2.3 vs browns -.9, which is misleading