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Estimation of FIP coefficient in Korea professional baseball
Journal of the Korean Data & Information Science Society 2017;28:625-33
Published online May 31, 2017
© 2017 Korean Data & Information Science Society.

Jangtaek Lee1

1Department of Applied Statistics, Dankook University
Correspondence to: Jangtaek Lee
Professor, Department of Applied Statistics, Dankook University, 126, Yongin, 16890, Korea. E-mail:
Received March 1, 2017; Revised March 26, 2017; Accepted March 27, 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.
Fielding Independent Pitching (FIP) is a statistic that measure pitcher performance by eliminating plate appearance outcomes that involve defensive play. FIP uses pitcher dependent outcomes such that walks, strikeouts, hit by pitches, and home runs allowed. The FIP equation derived from linear weights uses three coefficients 13, 3, -2 for evaluating Major League Baseball pitchers. However, these coefficients derived from run value of major league baseball are not suitable to Korea Baseball Organization pitchers due to baseball circumstances. In this study, new FIP called kFIP for Korea Baseball Organization pitchers are provided. We recalculate coefficients and get 14, 3, -1 for evaluating Korean Baseball pitchers. As a result, kFIP is statistically significantly better than FIP at predicting pitcher ERA in KBO League.
Keywords : ERA, FIP, KBO, pitcher, run values.