verlander: Justin Verlander
In homerhanumat/tigerstats: R Functions for Elementary Statistics

PITCHf/x data on Justin Verlander, winner of the 2011 Cy Young Award. Covers his 2009 through 2012 seasons.

A data frame with 15307 observations on the following 12 variables. Each observation is a single pitch.

season: The year of play
gamedate: Date of the game in which the pitch was thrown
pitch_type: Type of pitch thrown: CH (Change-up), CU (Curveball), FF (Four-Seam Fastball), FT (Two-Seam Fastball), SL (Slider). Pitch type is determined by computer algorithm.
balls: Current ball count
strikes: Current strike count
pitches: number of pitches previously thrown in the game
speed: speed of pitch (in mph). (When crossing plate?)
px: x-coordinate of pitch (in feet, measured from center of plate)
pz: vertical coordinate of pitch (in feet above plate)
pfx_x: the horizontal movement, in inches, of the pitch between the release point and home plate, as compared to a theoretical pitch thrown at the same speed with no spin-induced movement. Measured at 40 feet from home plate.
pfx_z: the vertical movement, in inches, of the pitch between the release point and home plate, as compared to a theoretical pitch thrown at the same speed with no spin-induced movement. Measured at 40 feet from home plate.
batter_hand: A factor with two values: L (left) and R (right).