Sure let's say I want to prove left hooks deal more damage than jabs
(to prove that, run it like a scientific study, have 1,000 fighters throw jabs and hooks and measure the force of each jab vs. hook by each fighter, run it enough times with enough variations that any differences in damage are insignificantly enough to be ignored.)
Then, the next step is just to come up with a rule that quantifies it. Such as, 3 jabs = 1 hook.
If we can quantify when you are guilty of murder, guilty of rape, when you have intent to defraud, we can easily quantify damage in MMA.
To quantify something, all you have to do is create a definition and then use that definition in all instances. It's essentially how everything is quantified in modern society.