These pages explain what each model measures, how the grades are trained, and how to interpret every score you see in the app.
DLoc+ measures descriptive command, while PLoc+ projects what that command signal should look like next year at the pitcher-season level. Stuff+ measures physical nastiness on residual xRV after command is removed, and Pitching+ brings descriptive command and stuff back together with sequencing and context.
All pitch grade models target xRV. Negative xRV means runs prevented (good for pitchers). Every score is scaled to a 100 mean so higher is always better.
DLoc+ (Descriptive Location+) surface grade for how well pitches were actually located.
Pitcher-season projection of next-year DLoc+ from this season's pitch-location behavior.
Physics-only model trained on residual xRV after DLoc+.
Combined model that merges command and stuff into one grade.
