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.
over 2 years ago
TheBigStapler
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i've always wondered about this factor
especially in terms of john maine, since he seems to have that same “deceptive fastball” type thing as chris young. i’ve always thought that those 2 were the most pronounced from what i’d seen.
i’m not a BP subscriber so i can’t see the entire article but i guess theres no mention of maine?
No mention of Maine. The saddest thing about the article is that this calculation needs to be done by hand using still frames of pitching reel. To get really good numbers and data for all the players, PITCHf/x would have to track that information specifically. It would be impossible to get averages of every game for every player.
I wasn’t sure what could or couldn’t be posted here since it’s BP subscriber material so I didn’t re-copy the chart or any of the meat of the article.
by TheBigStapler on Sep 23, 2009 4:48 PM EDT up reply actions
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