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How is "adjusted sack rate" calculated?

I read some articles listing it, but for the life of me I can't seem to find out how it's calculated. I've seen it for offense and defense (rate of a defense getting them, and rate of an offense allowing them). It's not (sacks/sacks+pass attempts (for or against) ) as I tried that with various teams and it didn't equal the numbers I read online. Anyone know how this rate is calculated?

Public Comments

1. They have a sack rate?
2. Adjusted Sack Rate (ASR)/Sack Rate: Sack Rate represents sacks divided by pass plays, which include passes, sacks, and aborted snaps. It is a better measure of pass blocking than total sacks because it takes into account how often an offense passes the ball. Adjusted Sack Rate adds adjustments for opponent quality, as well as down and distance (sacks are more common on third down, especially third-and-long).