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Pitchfx Newsbeat

Friday, June 20, 2014

Orioles starters can’t fool hitters

Orioles starters have trouble getting batters to swing at pitches out of the zone, particularly Ubaldo Jimenez:

“Hitters swing at only 24.5% of Jimenez’s pitches out of the zone, fewer than one out of four. This is great, because he throws out of the zone so rarel—err, no, wait, he throws out of the zone 53.6% of the time. Dang.”

rpollack Posted: June 20, 2014 at 02:02 PM | 12 comment(s)
  Beats: orioles, pitchfx, pitching, strike zone

Monday, May 05, 2014

Amazin’ Avenue: The Myth of the Robotic Strike Zone

With a guest appearance by former BPros/now Astros’ front office expert Mike Fast:

One of his (Fast’s) conclusions has far reaching ramifications:

The utility and accuracy of a Zone Evaluation system that is used to grade major-league umpires based upon the unreliable PITCHf/x sz_top and sz_bot measurements is also called into question.

And he closes the piece with:

Short of having a more reliable method for measuring the actual stance of batters from video, it seems to make the most sense to set the top and bottom boundaries based upon the height of the batter and the average height of the pitches that the batter sees, as scaled to the average umpire zone. That is probably not a workable solution for the robotic home-plate umpires that many fans desire. Such a system would be slow to capture changes in batter stances and could be subject to manipulation. However, given the current data, it seems to be the best approach for analysis of strike zone data, and it is much more accurate than using the boundaries supplied in the PITCHf/x data.

Mike Emeigh Posted: May 05, 2014 at 09:09 AM | 27 comment(s)
  Beats: pitchfx, sabermetrics, umpires

 

 

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