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On Twitter, I've noticed one question come up over and over again:

https://twitter.com/4rest4rest4rest/status/897972938195976192

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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.

See SportsLogos.net for historical and current sports logos

Chris Creamer does amazing work at SportsLogos.net and I've been wanting to work with him for quite a while to put examples of past and current logos on our sites.  So when our 2016 redesign got underway, we worked out an agreement that we could use copies of his aggregated logos on our site.

We also realize that many historical logos show offensive representations of various ethnic groups and peoples that were commonplace in their time and in American society. These representations are wrong now and were wrong then. We present them, as we do all of our facts, to educate and illuminate, and these prejudices have been an unfortunate part of the history of the sports we all enjoy and love.

Obviously, we do not own these logos and cannot give you permission to use them. We use them under a fair use argument. We use small resolution images, which do not impact the economic viability of the logos for their owners. And we provide them for educational purposes only. It's up to you to know the relevant intellectual property law and, since I'm not a lawyer, this is clearly not legal advice.

Enough with the disclaimers. Check out some old-time teams for some old-time logo goodness.

Update: on March 23, 2017, we decided to remove logos prior to the seasons for which we have logos. For example if no logo was shown for 1892 Beaneaters we displayed their 1900 logo. This is mostly an issue for MLB, but could also arise elsewhere.

The 2015 MLB Trade Deadline was July 31st, 4pm ET.

Here we've collected all of the team trades in the run-up to the non-waiver trade deadline.

You can also find trades between any two teams in our Franchise-to-Franchise Trade Histories.

July 31:

Tigers trade Yoenis Cespedes to the Mets for Michael Fulmer and Luis Cessa.

Orioles trade Tommy Hunter to the Cubs for Junior Lake.

Mariners trade J.A. Happ to the Pirates for Adrian Sampson.

Marlins trade Dan Haren and cash to the Cubs for Ivan Pineyro and Elliot Soto.

Phillies trade Ben Revere and cash to the Blue Jays for Jimmy Cordero and Alberto Tirado.

Rays trade Kevin Jepsen to the Twins for Chih-Wei Hu and Alexis Tapia.

Mariners trade Mark Lowe to the Blue Jays for Jake Brentz, Nick Wells and Rob Rasmussen.

Brewers trade Gerardo Parra to the Orioles for Zach Davies.

Brewers trade Jonathan Broxton and cash to the Cardinals for Malik Collymore.

July 30:

Pirates trade Justin Sellers to the White Sox for player to be named later or cash.

Mariners trade Dustin Ackley to the Yankees for Ramon Flores and Jose Ramirez.

Astros trade Josh Hader, Adrian Houser, Brett Phillips and Domingo Santana to the Brewers for Mike Fiers, Carlos Gomez and cash.

As part of 3-team trade Braves send Jose Peraza, Bronson Arroyo, Luis Avilan, Jim Johnson and Alex Wood to the Dodgers. Dodgers send Paco Rodriguez, Zachary Bird and Hector Olivera to the Braves. Dodgers send Victor Araujo and Jeff Brigham and Kevin Guzman to the Marlins. Marlins send Mat Latos, Mike Morse to the Dodgers. Marlins send 2016 competitive balance round A pick to the Braves.

Tigers trade David Price to the Blue Jays for Daniel Norris, Matt Boyd and Jairo Labourt.

Tigers trade Joakim Soria to the Pirates for JaCoby Jones.

Indians trade Brandon Moss to the Cardinals for Rob Kaminsky.

Reds trade Mike Leake to the Giants for Keury Mella and Adam Duvall .

July 29:

Phillies trade Cole Hamels, Jake Diekman and cash to the Rangers for Matt Harrison, Jorge Alfaro, Alec Asher, Jerad Eickhoff, Jake Thompson and Nick Williams.

Royals trade Joe Blanton to the Pirates for cash.

Pirates trade Jayson Aquino to the Indians for cash.

July 28:

Phillies trade Jonathan Papelbon and cash to the Nationals for Nick Pivetta.

A's trade Ben Zobrist and cash to the Royals for Aaron Brooks and Sean Manaea.

Rays trade David DeJesus and to the Angels for Eduar Lopez.

Indians trade David Murphy to the Angels for Eric Stamets.

Rockies trade Troy Tulowitzki and LaTroy Hawkins to the Blue Jays for Jose Reyes, Miguel Castro, Jeff Hoffman, and Jesus Tinoco.

July 27:

Red Sox trade Shane Victorino and cash to the Angels for Josh Rutledge.

A's trade Tyler Clippard and $1MM to the Mets for Casey Meisner.

July 26:

Reds trade Johnny Cueto to the Royals for John Lamb, and Cody Reed.

July 24:

Braves trade Juan Uribe and Kelly Johnson to the Mets for John Gant and Rob Whalen.

July 23:

Brewers trade Aramis Ramirez to the Pirates for Yhonathan Barrios.

A's trade Scott Kazmir to the Astros for Daniel Mengden and Jacob Nottingham.

It's been a long cold winter here in Philadelphia. In honor of Sunday and Monday, the greatest days of the year, here are some Opening Day features we have here at B-R:

• 100 Years of Franchise Opening-Day Starters (1914-2013)
• Batting and pitching game finders can be set to search "In team's first x games":
  • Example 1: Most HR in team's 1st game of the season (1919-2010)
  • Example 2: Highest Game Score in team's 1st game of the season (1919-2010)
• Use streak finders to look for the longest streaks to open the season:
  • Example 1: Most consecutive games with a hit to start the season (2000-09)
  • Example 2: Most consecutive wins by a pitcher to start the season (1980-89)
• Game Previews
• Our Mobile Site is perfect for looking up stats at the game, in a restaurant, or on your couch. We even have every box score since 1914 available in an easy to use mobile format.

Give them a try, and enjoy baseball's return.

Jobs @ Sports Reference.

Sports Reference has an immediate opening for a web developer. Please see our job advertisement for all of the details. We will begin reviewing applications on August 26th.

Some of the common critiques of the Wins Above Replacement framework include: 1) Why do FanGraphs and Baseball-Reference.com have such different numbers, 2) How can we trust it when the numbers change, and 3) How can we trust it when I can't calculate it?

For the first question, our announcement today of a consistent replacement level between FanGraphs and Baseball-Reference.com has done a considerable amount to bring our two methodologies into alignment at least on the question of how big of a basket of WAR to hand out to players each year. Previously, FanGraphs allotted nearly 300 additional WAR due to a much lower replacement level. Our meeting in the middle has erased this difference to zero.

For the next two questions, I would point to a very widely quoted and very widely used statistic from economics, Gross Domestic Product (GDP). Here is the Wikipedia article on Gross Domestic Product. I'm going to argue that WAR is essentially GDP for baseball.

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With March Madness coming up soon, here's a quick reminder to check out S-R/College Basketball, our college hoops site. It has all of the team ratings and player stats you need to help fill out your bracket this season, plus historical data (including scanned stat sheets going back to the 1940s) and a Play Index just for college basketball. Give it a try today!

Several users have asked about how players qualify for the national, conference, and career leaderboards, so we've added a page to explain the minimum requirements needed to show up on those lists. Currently, they are as follows: