Baseball for the Thinking Fan

Login | Register | Feedback

btf_logo

News

All News | Prime News

Old-School Newsstand


Contributors

Jim Furtado
Founder & Publisher
Repoz
Editor - Baseball Primer

Syndicate

Pitch Framing Newsbeat

Monday, March 03, 2014

Baseball Prospectus | Framing and Blocking Pitches: A Regressed, Probablistic Model

Rather than identifying a single strike zone and giving binary credit for each pitch relative to that strike zone’s borders (i.e., strike or no strike), our model gives partial credit for each pitch based on that pitch’s likelihood of being called a ball or a strike. To determine that, we created a probability map of likely calls… To reflect what is best known about the way the size and position of the strike zone shifts from count to count and batter to batter, we ran individual models for each set of batter and pitcher handedness as well as [type of pitch]. The smoothing parameters of each model were allowed to vary by count, so that while the general shape of the strike zone derived for each variable combination did not change, the width and height of it did (reflecting, for example, a larger strike zone on 3-0 counts than on 1-2 or 0-2 counts). We also accounted for the changing size of the strike zone from season to season (although these yearly changes are much smaller than the other changes we measured).

We also corrected the data in several ways before running these models. First, all pitch classifications were hand-labeled by Pitch Info to eliminate variability in pitch labels… To account for batter height differences, we normalized the height of each pitch by the batter’s height using what is now the standard formula (first published by Mike Fast). We also used the correction scheme that Mike published at BP for correcting the X and Y location of each pitch based on the likely distribution of pitch locations that each pitcher would use against left-handed hitters and right-handed hitters…

Rather than simply give a single credit for each pitch (~.14 runs) as has been done in many previous models, we looked at the count in which each pitch was framed and gave credit equal to the difference in runs between framing or not framing that pitch. For example, a frame in an 0-2 count was counted as more valuable than a frame in an 0-0 count, because a frame in an 0-2 count can result in a large change in run expectancy while a frame in an 0-0 count does not have quite the same impact… The run value for a framed pitch is the run value differential for that count… multiplied by the residual of the probability—in other words, if an 0-0 pitch is called a strike in a spot where it’s normally called a strike just 80 percent of the time, the catcher will get 20 percent of the available value (.08) for a total of .0004 runs credited (which will later be adjusted based on the pitcher and umpire impact). Failing to get a strike on the same pitch would result in a .0016 run deduction…

We empirically determined each pitcher’s value—to isolate it from each catcher’s value—by performing a WOWY (“With or Without You”) analysis… We also made systematic but small changes to the data based on the umpire who was calling each game…

we have regressed career totals to the league average… Because seasonal variability is different from career variability, we also regressed seasonal totals to career totals based on a similar formula…

You can find all of this new framing and blocking information in a couple place on the Baseball Prospectus site.

The District Attorney Posted: March 03, 2014 at 11:00 AM | 30 comment(s)
  Beats: baseball prospectus, defense, pitch framing, sabermetrics

Friday, February 28, 2014

THT: The State and Future of Pitch-Framing Research

I often discuss pitch framing with my colleagues. The most common source of doubt I hear: The numbers don’t pass the sniff test. The infamous Jose Molina has too many smart people crinkling their brows. This is a determination each of us has to make. Can there be a possible 5-win data inefficiency that existed for 100-plus years of baseball history? Can it be possible such a big deal was missed for so long?

We have to ask ourselves: How important is pitch framing and receiving? How important can it be?

Good summary and reference.

villageidiom Posted: February 28, 2014 at 04:48 PM | 50 comment(s)
  Beats: catchers, pitch framing, pitch fx, war

 

 

BBTF Partner

Support BBTF

donate

Thanks to
The Id of SugarBear Blanks
for his generous support.

Bookmarks

You must be logged in to view your Bookmarks.

Hot Topics

NewsblogEx-MLB star Chuck Knoblauch accused of assaulting ex-wife
(1 - 5:24pm, Jul 24)
Last: Tulo's Fishy Mullet (mrams)

NewsblogTwitter / Ken_Rosenthal: Mariners announce acquisition of Kendrys Morales for RHP Stephen Pryor.
(8 - 5:24pm, Jul 24)
Last: PreservedFish

NewsblogOTP - July 2014: Republicans Lose To Democrats For Sixth Straight Year In Congressional Baseball Game
(3010 - 5:20pm, Jul 24)
Last: The Good Face

NewsblogOT: Monthly NBA Thread- July 2014
(909 - 5:17pm, Jul 24)
Last: HMS Moses Taylor

NewsblogAs shifts suppress offense, time has come to consider a rule change
(88 - 5:16pm, Jul 24)
Last: Fancy Pants Handles lap changes with class

NewsblogOMNICHATTER: 7-24-14
(30 - 5:11pm, Jul 24)
Last: Davo Dozier

NewsblogYadier Molina serves his brother crackers on a plate — home plate
(29 - 5:11pm, Jul 24)
Last: Greg K

NewsblogPrimer Dugout (and link of the day) 7-24-2014
(9 - 5:01pm, Jul 24)
Last: Eric J can SABER all he wants to

NewsblogBuck Showalter, Tommy Hunter bemoan shrinking strike zone in Orioles loss
(8 - 4:58pm, Jul 24)
Last: Los Angeles El Hombre of Anaheim

NewsblogIntentional Walk Issued to Bonds Yields Unintentional Disbelief (Happy Birthday, Barry)
(6 - 4:57pm, Jul 24)
Last: Batman

NewsblogOT: The Soccer Thread July, 2014
(381 - 4:56pm, Jul 24)
Last: Fancy Pants Handles lap changes with class

NewsblogFivethirtyeight: Billion-Dollar Billy Beane
(10 - 4:54pm, Jul 24)
Last: AROM

NewsblogCSN: Enough is enough — time to move on from Ryan Howard
(68 - 4:18pm, Jul 24)
Last: Tom Nawrocki

NewsblogPaper of Record Archives (Vintage Sporting News) Gone
(31 - 4:14pm, Jul 24)
Last: Batman

NewsblogA's designate Johnson for assignment
(11 - 4:05pm, Jul 24)
Last: Batman

Page rendered in 0.9298 seconds
51 querie(s) executed