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sparendo
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Baseball Prospectus http://bbp.cx/i/1575
sparendo
(1575)
Comment rating: 0

They had them--left field in the HHH Metrodome.

 
sparendo
(1575)
Comment rating: 0

Cool, got it. Thanks.

Apr 23, 2009 4:22 PM on Inside Pitch-f/x
 
sparendo
(1575)
Comment rating: 0

Well, let me ask it this way...suppose a righty threw one of those Platonic no spin pitches, where the pitch ended up exactly where calculations show it would from the initial speed and direction of the pitch. From what you wrote, the PFZ would be 0--which makes sense. I would think the PFX would also be 0, since it wound up where it would have without break, but it seems you're saying it would be some negative amount since the release point was to one side of the plate.

Apr 23, 2009 4:00 PM on Inside Pitch-f/x
 
sparendo
(1575)
Comment rating: 0

BTW, as an addendum to my previous comment, it seems like you were describing PFZ in the way I thought it was, but PFX was described differently. And I also wanted to compliment you on the article...good read, and a cool look at a game from the PFX standpoint.

Apr 23, 2009 3:40 PM on Inside Pitch-f/x
 
sparendo
(1575)
Comment rating: 0

Are you sure about this? "Many have wondered why lefties post negative horizontal movement marks while righties post positive numbers, and the reasoning deals with the position of home plate relative to the catcher and umpire. Positive PFX_X data indicates that the pitch came from the right of the catcher and umpire, which is where lefties release the ball. Right-handed hurlers release the ball from the left of the plate, corresponding to the negative numbers." I was under the impression that the PFX took the initial velocity of the ball, calculated where it would go and used that as the point of comparison. That is, there is the tendency for the direction to do as you said, but I thought PFX already took that into account and calculated the difference between the actual X axis movement and the projected no-spin X axis movement.

Apr 23, 2009 3:35 PM on Inside Pitch-f/x