As a baseball fan, I’ve always wondered how many times a judgment made by an umpire is reversed in a baseball game through VAR.

By collecting and running regressions on officially available data,

I identify which umpires are more accurate compared to other umpires.

 

Below is the ranked data for the Lead Umpires in each of the KBO umpire groups. For the past 3 years, the KBO umpires have been divided into 6 different groups, with the following leaders: SW Choi, IS Jeon, KT Park, YJ Lee, JC Park, and MH Lee.