In baseball, Bill James pioneered a concept called “similarity scores.” The whole idea is that a player that wants to be considered for the Hall of Fame should be similar to other Hall of Famers. So, he would take every single counting statistic (hits, runs, HR, RBI, BB, SB) and find the players most similar to any particular player. We can use the same concept in football.
People are obsessed with franchise quarterbacks. How do you know when you have one? NFL teams have done this for us. We are taking the top ten highest paid quarterbacks (not including Aaron Rodgers and Kyler Murray) and coming up with a composite (or numerical average) performance over a set of ratio statistics.