Posted by Thallen

I don't know, because first on that list is "average opponent W/L ratio," and what I mean by that is if you spar a 100-300, a 500-1000, and a 100-100, it's going to show you as sparring a 0.6 ratio on average and then everyone is going to laugh at you

Average opponent W/L ratio would be a good multiplier in any equation to determine how good someone is, same thing as PPS like what Mikva/Zetectic posted
If someone has an 8.2 spar ratio, a 1.5 opponent ratio, and they average winning by 1.2 hearts, there's probably a formula you can come up with to get their average Aguzo Performance Ranking... or something

I'm sure people would still boost or spar selectively to get some of those stats up though, but there's no cure for cancer
Anyway, these threads are probably more interesting than undeniable proof