What is Form?
Recent form as a difficulty-adjusted strokes-gained figure: each recent round scored against how hard it actually played, with the latest starts weighted most and thin samples pulled toward the field average.
Backed out of published round scores via a round-difficulty regression (no per-round SG feed is required); small-sample players are shrunk toward an average-tour-player baseline so noise can't spike them.
OTIS tracks this stat across 15 PGA Tour seasons — see it for every player, or read how the numbers are sourced in the methodology.