PDA

View Full Version : Getting closer...a lot closer...to being able to accurately measure defense...



Kingspoint
06-16-2011, 01:53 AM
Sportvision's new tool is FIELDf/x, which should open up the fielding toolbox in the same way that PITCHf/x created a deeper understanding of pitching. Instead of simply measuring a player's output (e.g., where he caught the ball), FIELDf/x should allow for a more accurate measure of a player's fielding process. Who gets the best jumps on fly balls? Which team does the best job of defensive positioning, getting its players in the right place to make plays before a ball's even hit? What's the optimal shift to employ against a particular slugger? FIELDf/x won't provide all the answers, but if the data compiled by the project gets released to the public, it will bring researchers much closer to them.

http://espn.go.com/blog/sweetspot/post/_/id/5041/fieldfx-is-going-to-change-everything

Kingspoint
06-16-2011, 02:01 AM
Rybarczyk believes that even as we cut our measured plays from a few hundred (per player) to something less than 100 per season, what we lose in sample size we'll gain in sample importance, and that the one-season numbers will give us a more accurate appraisal than we've got now. (so that you don't need three years, but one to measure a player's defense using statistics.)

lollipopcurve
06-16-2011, 08:24 AM
Rybarczyk believes that even as we cut our measured plays from a few hundred (per player) to something less than 100 per season, what we lose in sample size we'll gain in sample importance, and that the one-season numbers will give us a more accurate appraisal than we've got now. (so that you don't need three years, but one to measure a player's defense using statistics.)

Not surprising. There's a long way to go in refining fielding stats and this seems like a nice advance -- weeding out those plays that no fielder makes (beyond possibly committing an error on the ball after it's landed), and then, I would say, devaluing those routine plays that all make (thinking here especially of OF play). Basically, understanding the characteristics of each ball in play much better than assigning it a zone.