Derby and Performance Figures

[The Indomitable DrugS]

Originally Posted by somerfrost

I find the use of Dr Roman's Performance Figures (PF's) superior to Beyer Speed Figures in handicapping the Derby. Since 1998 (first year PF's computed) 10 of 13 Derby winners had a PF within the top 5 horses in the race. The average winning PF in the Derby has been -57 (Monarchos tops with -75, Mine That Bird slowest with -42). This year to date (two turn races) among possible starters:
The Factor -57 (last -18)
Pants on Fire -57
Nehro -56 (last -52)
Shackleford -54
Dialed In -54
Archarcharch -53
Still a couple races to go but these appear the best, note The Factor's last race may eliminate him.

What in the hell is a 'Dr. Roman's Performance figure' ?