Determine whether post-overturn adjustments persist across games

Determine whether smaller carryover effects of automated overturns on MLB umpires’ subsequent strike-zone boundary judgments persist into the opening portion of the umpire’s next game.

Background

The study finds that an automated overturn is associated with a directionally appropriate, localized adjustment in the umpire’s called boundary during the remainder of the same game. However, the corresponding effect is not statistically detectable in the opening window of the umpire’s next game.

Because the confidence intervals for the next-game estimates remain wide, the results do not exclude smaller persistent effects. Establishing whether such effects exist would clarify whether automated feedback produces only short-lived adjustments or also causes weaker forms of cross-game recalibration.