Baseball for the Thinking Fan

Login | Register | Feedback

btf_logo
You are here > Home > Baseball Newsstand > Baseball Primer Newsblog > Discussion
Baseball Primer Newsblog
— The Best News Links from the Baseball Newsstand

Saturday, May 25, 2013

Reliever Pitching Metric Correlations, Year-to-Year | FanGraphs Baseball

It makes perfect sense. Starters having more pitches to fall back on. Relievers usually only have one or two good pitches, so the pitcher has less options to make adjustments.

This lines up well with what Jeff Zimmerman and I found regarding pitcher aging and how it differs depending on a pitchers role.

Let’s take the example of strike outs. Jeff and I found that while starting pitchers were able to mitigate against their decline in velocity–and therefore experienced a less drastic decline in their strike out rate–relievers were far more dependent on their velocity. As a result, relievers generally were more likely to see sharper declines in strike out rates from year to year.

Jim Furtado Posted: May 25, 2013 at 10:28 AM | 2 comment(s) Login to Bookmark
  Tags: pitching, sabermetrics

Reader Comments and Retorts

Go to end of page

Statements posted here are those of our readers and do not represent the BaseballThinkFactory. Names are provided by the poster and are not verified. We ask that posters follow our submission policy. Please report any inappropriate comments.

   1. valuearbitrageur Posted: May 25, 2013 at 01:24 PM (#4452001)
Finally an explanation for the rapid decline of Mariano Rivera.

Only 6.x K/9, and has given up almost 4 runs in barely 18 innings
   2. Mike Emeigh Posted: May 25, 2013 at 02:00 PM (#4452022)
If you read the comments, MGL makes an important point:

Without matching up the underlying number of TBF (so that it is the same for starters and relievers), a comparison of correlations is worthless.

As it turns out, if you use the same number of underlying TBF (which is difficult obviously, since relievers max out at around 300 or so), you will find that relievers have a HIGHER correlation than starters. My guess is that their true talent changes less from season to season for a variety of reasons, perhaps one of them being more stable health due to fewer pitches thrown.


Relievers face about 1/3 the number of hitters that starters face, so you would expect more Y-T-Y variability simply because of the smaller samples.

-- MWE

You must be Registered and Logged In to post comments.

 

 

<< Back to main

BBTF Partner

Support BBTF

donate

Thanks to
HowardMegdal
for his generous support.

Bookmarks

You must be logged in to view your Bookmarks.

Hot Topics

NewsblogNL WILD CARD 2014 OMNICHATTER
(63 - 8:21pm, Oct 01)
Last: esseff

NewsblogNed Yost on the sixth inning and his bullpen usage: “its just one of those things” | HardballTalk
(106 - 8:18pm, Oct 01)
Last: Jolly Old St. Nick Is A Jolly Old St. Crip

NewsblogOT: Politics, October 2014: Sunshine, Baseball, and Etch A Sketch: How Politicians Use Analogies
(130 - 8:14pm, Oct 01)
Last: The John Wetland Memorial Death (CoB)

NewsblogOT: Monthly NBA Thread - October 2014
(14 - 8:12pm, Oct 01)
Last: madvillain

NewsblogBaseball Will Test Out Six New Rules To Speed Up The Game
(22 - 8:12pm, Oct 01)
Last: pthomas

NewsblogFangraphs (Sullivan): How Jarrod Dyson Stole The Biggest Base Of His Life
(2 - 8:07pm, Oct 01)
Last: Brian White

NewsblogAdam Dunn, 34, calls it a career
(64 - 8:06pm, Oct 01)
Last: Booey

NewsblogLinkedIn: 10 Sales Lessons From “The Captain”
(19 - 8:01pm, Oct 01)
Last: Howie Menckel

NewsblogA’s wild swing of a season ends in wild-card loss to Royals
(28 - 7:44pm, Oct 01)
Last: Misirlou's been working for the drug squad

NewsblogPrimer Dugout (and link of the day) 10-1-2014
(14 - 7:27pm, Oct 01)
Last: BochysFingers

NewsblogFOX (Rosenthal): Kansas City Royals exorcise city’s three decades’ worth of demons
(14 - 7:22pm, Oct 01)
Last: Zach

NewsblogDayton Moore's vision for Kansas Royals validated - ESPN
(43 - 7:22pm, Oct 01)
Last: Walt Davis

NewsblogAL WILD CARD GAME 2014 OMNICHATTER
(1136 - 7:13pm, Oct 01)
Last: Jim Kaat on a hot Gene Roof

NewsblogPosnanski: The Beauty of Belief [Royals win Wild Card, headed to ALDS]
(2 - 7:07pm, Oct 01)
Last: The District Attorney

NewsblogOT: The Soccer Thread, September 2014
(489 - 6:52pm, Oct 01)
Last: Swedish Chef

Page rendered in 0.1811 seconds
52 querie(s) executed