Quote Originally Posted by pbmax View Post
But it gives you a very good sense of who has sustained success (Bears and Packers) who has been mediocre for a LONG time (Bears then Giants-even with 5 Super Bowl wins between them) and the expansion teams who rise above all others, the Browns, and the single biggest era jump in the chart, Walsh's 49ers. Unless you want to give full credence to the AAFC, in which case I think the Browns increased their overall margin nearly by nearly 3,000 points in slightly less time than Walsh and the 49ers did.
I'm afraid those graphs have got me very cranky indeed. I'm all for integration, but this is ridiculous. It is NOT useful for looking at eras. Slopes at left end of plot are less significant than changes at right. A more interesting graph would just show margin of victory, with maybe a smoothing filter (moving average) to show era trends clearer.

Very disturbing. I'm inconsolable - don't talk to me about this again.