The accusations grow more venemous. Billick charges QBPR with uselessness in the extreme. ANS calls it non-predictive nonsense. Ouch! Evidence from a sample of 64 games from the 2010 season suggests otherwise (2 games from each week using the first Sunday and last Sunday afternoon games listed on Yahoo scoreboard; if a game had more than just a few throws by someone other than the starting QB, I used the adjacent game). QBPR explains 60 percent of offensive point variation among the teams. The difference in Passer Rating between the two QBs in the game explains 65 percent of the variation in score differential. No subset of the structural components (including allowance for non-linear effects) improved these results, nor did experimenting with inclusion of sacks or a few other variables.
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