Player metric landscape: where the honest line is drawn
Support = raw input-column coverage only, never a claim that a branded metric is reproduced.
How to read this figure
Each metric family carries a verdict of supported, partial, or not_supported alongside the exact input columns it would need.
What it means
The landscape maps which player metrics the raw data actually supports. Full box scores (0% missing across 807 players and 3,611 games) support a transparent box-only value index, per-36 rates, and unadjusted on/off. But branded impact metrics require a league-wide RAPM target or continuous tracking the repo does not have, so they are explicitly not reproduced.
Caveats and confounds
Support means raw input-column coverage only, never a claim that a branded metric is reproduced; the gravity proxy, for example, rests on a 241-game CV subset, not league-wide coverage.