The Simple Technology That Accidentally Ruined Baseball; Derek Thompson; In The Atlantic; 2014-09-04.
tl;dr => inconsistent umpires were removed, low-but-legal strike zones were admitted.
- What the Heck is PITCHf/x; Mike Fast; In The Hardball Times Baseball Annual; 2010; 6 pages.
- Brooks Baseball, created by Dan Brooks
- Fangraphs, look for the PitchFx tab under each pitcher’s page.
- Texas Leaguers, created by Trip Somers
- Dan Brooks; PITCHf/x, a tutorial
- My Fastballs, data dictionary of XML fields in the Gameday data
- Dr. Alan Nathan; Physics of Baseball
- MLB Gameday has the raw XML
- Baseball on a Stick, has data to download.
- How to Build a Pitch Database
- Jeff Zimmerman, Darrell Zimmerman; a database of PITCHf/x data, for download