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Definitions (30)
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release
Measures the time from pitcher's first movement out of the stretch to the release point of the pitch.
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extension
Measures the distance of the release point of the pitch from the front edge of the pitching rubber.
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velocity
Measures the peak velocity of a pitch at any point from its release to the front edge of home plate.
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perceived velocity
Velocity of the pitch at the release point normalized to the average release point for MLB pitchers. For example, a 90-mph pitch at a 54-inch release point will seem faster to the batter than a pitch of the same velocity thrown from a 56-inch release point.
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spin rate
Measures the spin rate of the ball at the point of the release from the pitcher's hand.
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exit velocity
Velocity of the ball off the bat on batted balls.
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launch angle
The vertical angle at which the ball leaves the bat on a batted ball.
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vector
Classifies the horizontal launch direction of the batted ball into five equal zones of 18 degrees each.
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hang time
Measures the time from bat contact to the ball either hitting the ground/wall or contact by a fielder.
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hit distance
Calculates the distance on the ground of the actual landing point of any ball hit into play, ground/wall or contact with fielder, regardless of outcome.
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