Every pitch, from how it was thrown and where it ended up. 100 is league average; 10 points is one standard deviation.
Velocity, release point, extension, movement along the pitcher's arm slot, seam-shifted wake, approach angles, and plate location. Count, batter, and results are not inputs.
The average of a pitcher's pitch grades, on one scale for starters and relievers.
MLB 2015 onward and Triple-A. Before 2021, when Statcast did not record arm angle, each pitcher's arm angle comes from his tracked seasons.
