Snellinger and the Jungle of Doom

On the one hand, free agency is an important right that grants players the power to choose their employer and negotiate a fair salary. On the other hand, job hunting is super, mega stressful. I don’t say this to imply anyone should try to avoid free agency, but rather to acknowledge that some things are objectively good and still leave you so nervous about making the wrong choice that you impulse purchase one of those patron saint figurines from a display near the register at a convenience store, then bury it in your front yard for good luck while sipping on a cherry coke slushy, even though you’re not particularly religious, and looking back with the clarity of hindsight, you’re pretty sure that figurine was an angelic depiction of Dale Earnhardt Sr.
Anyway, players don’t need to rely on Nascar voodoo to make career choices. A more logical system is possible. Specifically, a system to help players evaluate which teams tend to facilitate a player’s best on-field performance. In a previous piece, I compared the performance of players acquired by the Angels to that of players acquired by the Dodgers in the name of comparing how Shohei Ohtani’s stint with the Angels might have gone if the Angels were secretly run by the Dodgers. But why stop there, when we can compare all 30 teams and give free agents a feel for which clubs are most likely to offer a boost to their performance and which ones are baseball purgatory?
But first, let’s run through the methodology. In back-to-back seasons, it’s reasonable to expect a player’s performance to be roughly the same aside from the usual variation within a player’s true talent range and a mild adjustment for aging (insert caveats on injuries and other extenuating circumstances here). So if a player changes teams and goes on to post notably different numbers, it’s reasonable to credit a decent chunk of the change in output to the new work environment. Therefore, comparing player performance in adjacent seasons with different teams and aggregating at the team level provides a metric for evaluating how well a team maximizes the ability of its major league acquisitions. Read the rest of this entry »