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Estimation of weighted on base average in the Korean pro-baseball
Journal of the Korean Data & Information Science Society 2018;29:467-74
Published online March 31, 2018
© 2018 Korean Data and Information Science Society.

Jangtaek Lee1

1Department of Applied Statistics, Dankook University
Correspondence to: Professor, Department of Applied Statistics, Dankook University, 126, Yongin, 16890, Korea. E-mail:
Received March 5, 2018; Revised March 19, 2018; Accepted March 21, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Weighted on base average (wOBA) can be used to measure a hitters overall offensive value by assigning a weight to each distinct offensive event including walks, HBP, singles, doubles, triples and home runs. The wOBA formula with weights change on a yearly basis, so we must find the specific wOBA weights for every year. Also weights says about wOBA is not KBO but MLB. In this study, we provide weights of wOBA to measure an offense in KBO. The linear weights for events in KBO were: HR 1.94, 3B 1.76, 2B 1.38, 1B 0.92, HBP 0.77, uBB 0.70. There are strong correlations between wOBA and team runs per game using our weights in KBO. The relationship between two variables was explained using regression analysis.
Keywords : Correlation, KBO, runs, weight, weighted on base average.