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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.
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.
Base-to-base Time
How much time, in seconds, it takes a runner to get from one base to another, like Home To First.
Distance Covered
How far, in feet, a fielder or runner has traveled on a play.
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.
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.
Best Speed
For a batter, Best Speed is an average of 50% of his hardest hit balls. For a pitcher it is the average of his softest 50% of batted balls allowed.
Escape Velocity
Escape Velocity takes the average of a player's batted ball velocities subtracted from 88. Anything below 88mph is considered 0.
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