Descriptive statistics for the data used.

This study examines a previously unexplored concept in the field of sabermetrics. By employing a novel correction that accounts for player position differences, it investigates the impact of the designated hitter (DH) system on team wins in Japanese professional baseball using the Wins above Replacement metric. We applied this innovative correction to Pacific League data from 2014 to 2023, accounting for positional differences in player contributions. Our results indicate no significant difference in the correlation coefficients between team average wins above replacement (WAR) and winning percentage under conditions including and excluding the DH position, suggesting that the DH system does not substantially impact team performance. These findings offer a nuanced understanding of the DH system’s role in baseball strategy and team dynamics.

本研究聚焦于赛伯计量学（sabermetrics）领域此前尚未被探索的概念。通过采用一种考量球员位置差异的新型校正方法，本研究借助胜利贡献值（Wins above Replacement，WAR）指标，探究了指定打击（Designated Hitter，DH）制度对日本职业棒球队胜场数的影响。我们将这一创新性校正方案应用于2014至2023年的太平洋联盟（Pacific League）赛事数据中，充分纳入了球员贡献中的位置差异因素。研究结果显示，在纳入与排除DH位置的两种条件下，球队平均胜利贡献值与胜率之间的相关系数并无显著差异，这表明DH制度并未对球队战绩产生实质性影响。本研究的发现为理解DH制度在棒球战术与球队动态中的角色提供了更为细致入微的认知。