The definition of the R programming language, as it relates to baseball data, was articulated in the book “Analyzing Baseball Data with R” by Max Marchi and Jim Albert. Individuals who do not wish to go through the entire process outlined below can still acquire the data as I’ve shared it via Google Sheets here -> You can export the results and take the first 25 players for each team as their Opening Day Roster. Once the data is extracted, the resulting data table can be further sorted and manipulated to remove all but the first game in a given season for every player. The code will also gather the game dates and relevant team information. The script essentially imports one or more years’ worth of Retrosheet event files and iterates through the data to extract the starters and substitutes from every game in the file. However, since I went to the trouble of writing an R script to facilitate my needs, I figured that I’d share the results with the community. I discovered the website which supports the Automatic Transaction Manager (ATMgr) developed by Gary Leven for APBA’s Baseball for Windows (BBW). Additionally, some of the current computer baseball simulations such as Out of the Park, Action! PC and Digital Diamond Baseball include built-in functionality or utilities that provide users with the option to incorporate Opening Day Rosters, As-Played Lineups and Real-Life Transactions into their replays. CNN Sans ™ & © 2016 Cable News Network.I wanted to utilize the Opening Day MLB rosters for various season replays in my computer-based simulations, but I wasn’t able to locate this information in the usual places (Baseball-Reference, Retrosheet, etc.) I belatedly found out that a number of individuals and volunteers in the sabermetric community have already done this work, scouring box scores and transaction pages to cobble together this data.

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Apba baseball schedule file