1st November 2016
Our historical performance data for professional leagues (affiliated minor leagues, independent minor leagues, fall/winter leagues, and other international leagues) is provided by and licensed from 24-7 Baseball and Chadwick Baseball Bureau. It incorporates the work of many stalwart baseball researchers, including Cliff Blau, Art Cantu, Frank Hamilton, Reed Howard, Kevin Johnson, Bob McConnell, Jack Morris, and Ray Nemec, as well as members of the Minor Leagues Committee of the Society for American Baseball Research. Perhaps most importantly, it builds upon the seminal work of Ed Washuta, who magnanimously provided the framework to make the whole thing possible.
As licensors of this data, Sports Reference LLC is not in a position to update and make corrections to the dataset ourselves. All proposed corrections are passed along to the Chadwick Baseball Bureau. Their focus is on making corrections for post-1960 data first and then pre-1960 data as time permits. This is largely due to the sheer scope of the project, but also for economic reasons. The economic value to us for information such as the 1929 California State League is minimal and likewise the market for licensing such data is effectively zero. We wish to have the most accurate datasets we can, but must operate within the economic constraints of what the market will bear.
We realize that this may mean that certain issues and errors may linger on the site for months or even years and apologize for all such errors.
You can use the Chadwick Bureau website to send corrections or changes to the data.