In-Season Batter Regression Tool Updated

by Bill Petti on Aug 29, 2011 12:36 PM PDT on Beyond the Box Score

click to enlarge Earlier this year I released a tool that allows you to quickly calculate what a batter's offensive line might look like if they were sporting the same BABIP and HR/FB this year as their 3-year averages. The tool isn't a competitor to ZiPS or any other projection tool, rather it...

A Question of Regression: Heat Maps

by Jeff Zimmerman on Nov 17, 2010 8:00 AM PST on Beyond the Box Score

I recently published an article using heat maps over at Fangraphs showing differing batter strike zones, in which a question arose about Brett Gardner vs. LHP. In particular, the question asked about a single way inside pitch that Brett swung at as seen in this image: It looks like he swings at...

Mike Pelfrey's Worst Nightmare

by James Kannengieser on Sep 10, 2009 4:07 AM PDT on Amazin' Avenue

(Click to embiggen - Recommended in order to read the blurry years, which are tough to decipher because of Roger Dorn's presence) Here are the infield UZR figures in numerical form: Year UZR 2006 7.9 2007 10.6 2008 -7.7 2009 -25.4 Quick interpretation of the data - the Mets'...

Clarifying Regression

by R.J. Anderson on Aug 6, 2009 7:26 PM PDT on DRaysBay

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Rays Who? Regression What?

by larry on Apr 19, 2009 1:33 PM PDT on South Side Sox

Identifying Candidates for Regression

by Matthew on Mar 27, 2008 8:00 PM PDT

There are two main areas you should look at when judging whether a pitcher is due for regression (either good or bad). First, you look for extreme values in areas that we know are under little or no control of the pitcher. BABIP (average value for SP = .296, RP = .293) is the premier example. If a...