These pages explain what each model measures, how the grades are trained, and how to interpret every score you see in the app.
Location+ measures command. Stuff+ measures physical nastiness on residual xRV after command is removed. Pitching+ brings both signals 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.
