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Checking the Numbers: Perceived Velocity
By Eric Seidman via Baseball Prospectus (subscription required). Discusses the difference between actual velocity and "perceived velocity," which is calculated photogrammetrically by release point using PITCHf/x data. Helps to explain why Chris Young is so good despite mediocre velocity. Heath Bell and Francisco Rodriguez's appear faster than they are while Johan Santana's appears a smidge slower.
