QBV is a statistical measurement that tries to measure the inherent value of each signal-caller.
We use nine different measurements to create QBV (a 10th is in the works for next week). A perfect score is 57.4257. Anything in the 40s is very good. High 30s is still above average, and mid-to-low 30s is average and so on.
The nine measurements are:
Last Week's Performance (LWP)
Since this is the first week that this algorithm has been used, it will severely be altered by LWP. As the season progresses, this impact will decrease yet remain a factor in the calculations.
Age and Experience (AGE)
Most notably playoff experience and experience in meaningful games in November through December.
The inverse of AGE, POT gives further value to the young quarterbacks and shows that they still have some growing to do. POT definitely factors into each quarterback's value.
The most important measurement. This measures how well each QB plays under pressure in the fourth quarter and how well they survive 3rd-and-long. Being clutch is the epitome of being a QB, and we wanted these "clutch" QBs to be heavily rewarded. Sorry Romo.
QBs can be very effective, but if they don't play, they don't have value. As a result, those QBs who are consistently on the field should be more valuable. Sorry Vick.
Past-Year Return (PYR)
As great as three weeks of football is, we cannot discount the fact that last year Peyton Manning didn't play, Mark Sanchez was terrible and Aaron Rodgers was god-like—it needed to be factored in.
Quality of Opponent (QoO)
Working against LWP, QoO needs to account for whether or not the quarterback played against the Colts or the 49ers. In order to isolate each quarterback's value, this is very important.
Quality of the running game (RG)
A solid running game is a QB's best friend. If you have Arian Foster/Ben Tate or Ray Rice, each defence will focus on stopping them. They won't do so regarding Stevan Ridley, so as a result, it needs to be factored in.
Overall Team Competency (TC)
Having Megatron can really bump up your stats, and having Braylon Edwards can really kill your stats. Moreover, having a defense that allows 28 points in the first half alters your game plan, so in the hope of isolating each QB we need to factor in the quality of their team.
NOTE: For some categories (e.g. DUR or PYR), rookie QBs will get a default ranking of 7/10.