First and foremost, I need to acknowledge the fine folks at Project Retrosheet for supplying the play-by-play info which I used to calculate the statistics for seasons 1956 to 1998 and 2000 to 2002. They ask all users of their data to include the following disclaimer along with their "product", so here you go:
The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at 20 Sunset Rd., Newark, DE 19711.
If everything goes according to plan, I will also be using their data to calculate BP stats for past playoff years, and I will likely also use it to standardize the names and numbers in the database from 2003 onwards. Retrosheet is really the most fantastic resource for baseball data available on the web, so you should check out their work, if you haven't done so already.
For the time being, the data from 1999 and 2003 to the present day is calculated using the information supplied by espn.com and sportsline.com in their daily game logs. I also occasionally refer to mlb.com's GameDay data to verify/clarify the game data I find elsewhere.
I need to thank Joe Novarro, whose criticisms back in the very early days of this project helped inspire the ideas of "outs produced" and "bases lost" statistics--and who is still encouraging me to get my ideas out there. :-)
I also need to thank Patrick Arnold, who remains the most knowledgeable baseball fan I know, and is one of the few people who has read both versions of the Bases and Outs manuscript.
I'd like to thank Michael Fisher for lots of interesting conversations about baseball stats, and also for being the most enthusiastic contributor to the Bases Produced bulletin board, back in the day. :-)
There are two people (that I know of) who have independently developed a stat similar to Bases Produced. One of these people is Gary Hardegree, who published a paper on his ideas over at retrosheet's site. The other such person is Paul Tagliaferro, who--like Gary--lives in Massachusetts but I'm not sure if he's published his ideas anywhere yet.
Lastly, I should also thank Tom Tippett, the founder of Diamond Mind, for encouraging me to submit Bases Produced stats to a more rigorous statistical analysis.
The BP project has benefited greatly from everyone who has ever contacted me about it, so, if you have any ideas on baseball stats that you'd like to share with me, please don't hesitate to send me an e-mail at swinters AT basesproduced DOT com.
I also need to thank Paul Davis, who introduced me in January of 2000 to the scripting language Perl, without which I would not have been able to calculate all of the stats in this ever-growing system. Along the same lines, I need to thank Kiyoko Yoneyama for loaning me her Perl book, which--I am ashamed to admit--I have yet to return, eight years later.
Travis Greer, Jim Harmon, Matt Hyclak and Jeff McCune have also chipped in with technical help, and I need to thank Keith Johnson for giving me an education on .cgi scripting--and for being an understanding advisor when I put off my graduate career to work on baseball stats!
Dad Winters, Mom Winters, Richard Winters, Lisa, Rich, David and Jacob Dujmovic, Steve McHugh, Jeff Bogda, Shelly Bogda, Karen Lichtman, Liz Black, Jenny Vannest, Neva Kerbeshian, and Becca Ronquest.
And, finally, I want to thank everyone else I've ever talked to about Bases Produced over the past ten years--whether they really want to talk to me about baseball stats or not:
Erik Allen, Nick Altieri, Mike Armstrong, Ken Bame, Tessa Bent, Allison Blodgett, Adam Buchwald, Pete Clasquin, Wes Collins, Brianna Conrey, Cynthia Clopper, Robin Dautricourt, Caitlin Dillon, Robin Dodsworth, Bryan Donaldson, Jocelyn Doxsey, Steve Hartman Keiser, Dan Hennessy, Rebecca Herman, Luis Hernandez, Carrie Hixson, Zak Hulstrom, Beth Hume, Stefanie Jannedy, Tim Johnston, Jayes Lampkins, Susie Levi, Jeremy Loebach, Solveig Lubeley, Safiya Lyles, Laurie Maynell, Grant McGuire, James Mesbur, Jeff Mielke, Jeff Mulert, Adam Nunez, Syung Oh, Lee Rezabek, Josh Radicke, Ana Schwartz, Jeff Seagard, David Smith, Aditya Sood, Bob Stan, Liz Strand, Melissa Troyer, Giorgos Tserdanelis, Ara Vartanian, Shravan Vasishth, Jill Ward, Pauline Welby, and James Zhang.