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We dissect the properties of a big league changeup using Axis, Spin, Spin Efficiency, and movement to try and identify an optimal trajectory. Slide 1: What Makes a Good Changeup: An Investigation, 3 Part Series (Pavlidis, 2013) Video Access via Eric Jagers' Twitter Feed All Slides: Determining the 3D Spin Axis from Statcast Data (Nathan, 2007- Updated 2015) Data Courtesy of Baseball Savant
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