Here's the way I look at it. A rating is like a raw time at the racetrack. A horse might run 6f in 1:10. Another horse at another track might run it in 1:12. You can't compare the two because there are so many variables that go into why one was faster than the other. Same thing with a qb rating. One quarterback may play in a system that focuses on the deep pass. Another may play in one where 60% of his passes are 3-7 yard dinks. One quarterback may play with Barry Sanders and the other has Berry Gordy. So it's hard to compare them to each other and it's even harder to compare guys of different years or eras. But what you can compare with a little more accuracy is one horse against himself. If he runs six races at SA and all of them are between 1:09 4/5 and 1:10 2/5 then all of a sudden, he runs a 1:08, you know that was a really fast race for him or if it's a 1:12, it's a slow one. Same thing I'm doing here. I'm not focusing on how each quarterback compares against the others as much as I am looking at how they fare against themselves under the different levels of pressure. Looked at that way, I think the numbers are a good gauge and very useful.
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The real horses of the year (1986-2020)
Manila, Java Gold, Alysheba, Sunday Silence, Go for Wand, In Excess, Paseana, Kotashaan, Holy Bull, Cigar, Alphabet Soup, Formal Gold, Skip Away, Artax, Tiznow, Point Given, Azeri, Candy Ride, Smarty Jones, Ghostzapper, Invasor, Curlin, Zenyatta, Zenyatta, Goldikova, Havre de Grace, Wise Dan, Wise Dan, California Chrome, American Pharoah, Arrogate, Gun Runner, Accelerate, Maximum Security, Gamine
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