Evolving Hockey's Goals Above Replacement.
And this is an attempt to be *predictive*, so it should be looked at as purely entertainment value. Hockey analytics are constantly improving, but they're currently at the point where the results from looking backward have some pretty significant error bars ...trying to look forward is not going to produce anything remotely reliable.
(And the stuff that's publicly available is way behind the curve; anyone who's actually good at this is working for a team, not posting on a website named after a Magic The Gathering card).