Pitcher Speed and Break Changes

Pitch Type
CH, Change-up
CU, Curveball
EP, Ephuus
FA, Fastball
FC, Cut Fastball
FF, 4-Seam Fastball
FS, Split-finger Fastball
FT, 2-Seam Fastball
KC, Knuckle Curve
KN, Knuckleball
SC, Screwball
SI, Sinker
SL, Slider
UN, Unknown



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Pitch Type - The Pitch Types are designated by MLB and have not been corrected. In 2010, MLB went from using just FA (fastball) and divided it up into FF (4-Seam Fastball) and FT (2-Seam Fastball).

Span - Smoothing parameter for the data. As the span value is lowered, more fluctuations in the data data can be observed. If the value is lowered too much, too much noise will be added to the values. Generally the value should be between 0.25 and 0.50.