| dc.description.abstract | This study aims to compare the input and output performance of Japanese professional baseball players and national players between 2000 and 2017. Using Data Envelopment Analysis, the salary is the input, the pitcher output is the number of appearances, the winning vote, the earned run average; the wilderness is the home run, the RBI, the Batting Average, and the evaluation of the foreign and local fielder players. Technical efficiency, the second phase uses the Panel Tobit model of random effects to estimate the individual traits of the player such as height, weight, age, and the influence of the dominant hand on efficiency. The DEA estimates show that the efficiency of foreign players is generally lower than that of local players. This may be due to that foreign players have a good average score, but the salary is too high, resulting in low efficiency and the existence of national salary. The second phase of the regression found that young players are positively associated with efficiency, whether pitchers or field players: the weight of the pitcher is negative. Although foreign players have the effect of fighting strength, foreign players have limited quotas. In the long run, cultivating local young players can improve the efficiency of the team and help the future development of the Japanese professional baseball team. | en_US |