The raw data behind the story "The Best MLB All-Star Teams Ever" https://fivethirtyeight.com/features/the-best-mlb-all-star-teams-ever/.
mlb_as_play_talent
A data frame with 3930 rows representing Major League Baseball players in given seasons and 15 variables:
Player's ID at Baseball-Reference.com
The season in question
Order of All-Star Game for the season (in years w/ multiple ASGs; set to 0 when only 1 per year)
Game ID at Baseball-Reference.com
League of All-Star team
Position (according to baseball convention; 1=pitcher, 2=catcher, etc.) if starter
Estimate of offensive talent, in runs above league average per 600 plate appearances
Estimate of fielding talent, in runs above league average per 600 plate appearances
Estimate of pitching talent, in runs above league average per 200 innings pitched
Number of plate appearances in the All-Star Game itself
Number of innings pitched in the All-Star Game itself
Expected offensive runs added above average (from talent) based on PA in ASG, scaled to a 9-inning game
Expected defensive runs added above average (from talent) based on PA in ASG, scaled to a 9-inning game
Expected pitching runs added above average (from talent) based on IP in ASG, scaled to a 9-inning game
Expected runs added above average (from talent) based on PA/IP in ASG, scaled to a 9-inning game
https://baseball-reference.com , http://chadwick-bureau.com, Fangraphs