Chase Stuart at Football Perspective has an interesting article looking at the relationship between passer rating (or pass efficiency) and wins. He asks if passer rating is predictive of wins: "Essentially, . . . for predictive purposes, two of the four inputs in passer rating are meaningless. . . . Adding in the interception and completion percentage variables does nothing to make the formula more predictive. "What does make the formula predictive? Using net yards per attempt — which deducts sacks from a passer’s production — is the simplest and best way to predict future performance." Lots of statistics here, but interesting conclusions.