A number up to 10 ,that shows the "likeness of someone to survive" in a primitive environment with bare minimum to none resources.

Well I was watching Discovery's "Naked and Afraid" show (Global Showdown is on and... is tough). In the show they have this thing called PSR: a number that is associated to a person in the show trying to survive literally naked.... So, instead of jumping into the wild with no idea at all of what to do nor how, i decided to read about stuff and build me a tool. PSR in the show is obscure and non deterministic and opinion based... so, since i searched for a tool to asses myself and couldn't find a proper one .... had to make my own!