On my initial take of dingoach, I was trying to marry longevity of the career with success. For example Sir Ferguson would get a multiplier as his career was more like 3 careers at the high level, hence more credit. Yet as I thought more about my approach I decided it would be wiser to divide the rating into two. First is per game rating and the other one a total career Elo. A third approach would be adjusting for opposition strength which would help coaches from lesser leagues but it is very time consuming and I do not like time consumption. Again all the data from clubelo.com. The upside of this exercise has been reading about many coaches I did not know about. Oh Klopp; +488 and 0.90 per game. But if I did it the more accurate manner considering he spent time in Bundesliga 2 it would be +692 and 1.28. Very decent compared to Rodgers +180 and 0.65.
Per Game ELO