Major League Baseball recently released a report about pitcher injuries. It was the culmination of interviews with 200 subject-matter experts about the growing rash of arm troubles in the sport, and the word “stuff” was used 47 times. The report includes entire sections about the concept of stuff metrics — like Stuff+ — and how they may relate to pitcher health.
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The study of the physical characteristics of a pitch, and how they relate to outcomes, has been improved immensely over the past few years by new technology and machine learning techniques. Now a number like Stuff+ can tell you how good a pitch is based only on its velocity,
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