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Suggestion of starting pitcher ability index in Korea baseball - Focusing on the sabermetrics statistics WAR
Journal of the Korean Data & Information Science Society 2017;28:863-74
Published online July 31, 2017
© 2017 Korean Data & Information Science Society.

Hyeon-Gyu Kim1 · Jea-Young Lee2

12Department of Statistics, Yeungnam University
Correspondence to: Jea-Young Lee
Professor, Department of Statistics, Yeungnam University, Kyungsan 38541, Korea. E-mail:
Received May 16, 2017; Revised July 5, 2017; Accepted July 5, 2017.
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.
Wins above replacement (WAR) is the most commonly used statistics of the many sabermetrics that measure baseball players’ abilities. The advantage of a WAR is that it enables to compare performances of players even though they have different roles such as pitcher and hitter. However, WAR is difficult to obtain with common records. Thus, in this paper, we have calculated the sabermetrics variable based on Korean professional baseball records for the past three years (2014-2016). Using these variables, we suggest starting pitcher ability index that can replace WAR. Starting pitcher ability index was calculated by means of arithmetic mean, weighted average and principal component regression. Then, compared to the WAR, the most relevant method was selected, which would be useful to identify for the starting pitcher ability.
Keywords : Principal component analysis, principal component regression, sabermatrics, wins above replacement