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Statcast Glossary
Exit Velocity (EV)
How fast, in miles per hour, a ball was hit by a batter.
Launch Angle (LA)
How high/low, in degrees, a ball was hit by a batter.
Barrels
A batted ball with the perfect combination of exit velocity and launch angle
Hard Hit
Statcast defines a 'hard-hit ball' as one hit with an exit velocity of 95 mph or higher.
Launch Angle Sweet-Spot
A batted-ball event with a launch angle between eight and 32 degrees.
Batted Ball Event (BBE)
A Batted Ball Event represents any batted ball that produces a result.
Pitch Velocity
How hard, in miles per hour, a pitch is thrown.
Pitch Movement
The movement of a pitch is defined in inches, both in raw numbers and as a measurement against average.
Active Spin
Statcast refers to the spin that contributes to movement as Active Spin.
Spin Rate
How much spin, in revolutions per minute, a pitch was thrown with.
Extension
How far off the mound, in feet, a pitcher releases the pitch.
Pop Time
How quickly, in seconds, a catcher can get the ball out of his glove and to the base on a stolen base or pickoff attempt.
Arm Strength
How hard, in miles per hour, a fielder throws the ball.
Lead Distance
How far, in feet, a runner is ranging off the bag at the time of a pitcher's first movement or pitch release.
Jump
Jump is a Statcast metric that shows which players have the fastest reactions and most direct routes in the outfield.
Outs Above Average (OAA)
A range-based metric of skill that shows how many outs a player has saved over his peers.
Fielding Run Value
Statcast's overall metric for capturing a player’s measurable defensive performance onto a run-based scale, converting various metrics like OAA, blocking, framing, etc.
Catch Probability
The likelihood, in percent, that an outfielder will be able to make a catch on an individual batted ball.
Expected Batting Average (xBA)
xBA measures the likelihood that a batted ball will become a hit.
Expected Weighted On-base Average (xwOBA)
xwOBA is formulated using exit velocity, launch angle and, on certain types of batted balls, Sprint Speed.
Expected Earned Run Avg (xERA)
xERA is a simple 1:1 translation of xwOBA, converted to the ERA scale.
Sprint Speed
A measurement of a player's top running speed, expressed in "feet per second in a player's fastest one-second window."
Bolt
A Bolt is any run where the Sprint Speed (defined as "feet per second in a player's fastest one-second window") of the runner is at least 30 ft/sec.
EV50
For a batter, EV50 is an average of the hardest 50% of his batted balls. For a pitcher it is the average of his softest 50% of batted balls allowed.
Adjusted EV
Adjusted EV averages the maximum of 88 and the actual exit velocity of each batted ball event.
Blocks Above Average
A Statcast metric designed to express the demonstrated skill of catchers at preventing wild pitches or passed balls compared to their peers.
Bat Speed
Bat speed is measured at the sweet-spot of the bat. Average bat speed is the average of the top 90% of a player’s swings.
Fast Swing Rate
A fast swing is one that has 75 MPH or more of bat speed.
Swing Length
The total (sum) distance in feet traveled of the head of the bat in X/Y/Z space, from start of tracking data until impact point.
Squared-Up Rate
How much exit velocity was obtained compared to the maximum possible exit velocity available, given the speed of the swing and pitch.
Blasts
A more valuable subset of squared-up balls, defining batted balls that were both squared-up and with a fast swing.
Swords
A bat tracking metric that quantifies when a pitcher forces a batter to take a non-competitive, ugly-looking swing.
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