Benjamin Olson
Hero
Use a large corpus of real numbers from actual play. There are a lot of games going on, and while this would be a lot of work to get hold of, this would allow for actual statistics instead of what we have.
Given that there is a website devoted to Critical Role stats (which does, in fact, include how much damage each character has done on every occasion on which they have done damage), clearly we just need every other D&D group to become a phenomenally popular web series with an obsessive fan base.