https://www.saturdaydownsouth.com/sec-football/stat-shows-which-sec-qbs-are-hurt-most-by-dropped-passes/
The calculation is DROPS / (DROPS + COMPLETIONS)
It looks like it is removing bad throws and only factoring in drops as it relates to a % of catchable passes only.
Here is the list –
Nick Fitzgerald – 16.4%
Jake Bentley – 14.4%
Jarrett Guarantano – 12.8%
Ty Story – 12.4%
Kyle Shurmer – 12.1%
Feleipe Franks – 12.0%
Jarrett Stidham – 11.0%
Joe Burrow – 10.3%
Jardan Ta’amu – 9.9%
Drew Lock – 9.7%
Kellen Mond – 9.0%
Terry Wilson – 6.3%
Jake Fromm – 5.7%
Tua Tagovalia – 4.4%
Edited by Gamecock in TX at 08:52:51 on 10/19/18