The Most Fascinating Minor League Translations of 2023

When making any prediction for a young player, dealing with minor league data in an absolute necessity. This still remains a relatively new thing in baseball’s history, with little attention given to minor league stats until Bill James introduced his method of Major League Equivalency in the 1985 Baseball Abstract. Twenty-five years ago, I wrote one of the first things of mine to ever hit the broader internet, a quick primer on how to calculate James’ MLEs. Working with the data was immensely difficult at the time, and even worse when James was developing MLEs. There was no central repository of minor league stats, and just getting the current year was highly difficult; on the young internet of the time, you basically had to copy and paste from Baseball America’s basic data. For past years, there was just about nothing outside of what you could get from STATS. As a youngster, I pretty much spidered the data off of STATS on AOL, which surprisingly had the most data available publicly at the time.
Sabermetrics was a more difficult task back then. Even when Baseball-Reference initially became the first actually usable website, powered by the Lahman database, for the first few years, stats were updated after the season. There was no minor league data there, or anywhere, really. That improved in subsequent seasons, and with more data than James had to work with, people such as Clay Davenport, Voros McCracken, and myself were able to put together our own systems. ZiPS never becomes a thing without minor league data to work on to make the inputs properly. Since James is the one that broke ground, I still call the ZiPS translations zMLEs. These days, I have minor league translations going all the way back to the 1950s.
As we approach midseason, many of the current minor league translations in the upper minors have become highly interesting the farther we get from Small Sample Shenanigans. I wanted to take the opportunity to highlight some of the numbers with relevance to the rest of the major league season. Remember: minor league translations are not actual predictions but should be treated like any other line of play, with the same possible pitfalls, the same need for context, and the same opportunity to be misleading in certain ways, such as freak BABIP totals (though ZiPS tries to adjust for the last one). All these lines are adjusted to the context of the parent club’s home park and 2023’s level of offense in the majors. All translations are through Monday’s games. Read the rest of this entry »