한국 프로축구 선수의 경기수행력 평가지수 개발을 위한 주요 요인 탐색

Abstract

The purpose of this study is to propose an objective index to evaluate each professional soccer player’s performance in one game. In order to develop the index, the study was conducted based on the development of a three-step approach: searching for important factors that have effect on game performance using the delphi study, game analysis, and the index development. The Delphi study was based on the 3-steps survey answered by ten football specialists who answered questionnaires regarding major factors that influences each positions’ performance. For the game analysis, one out of the 14 K-league teams was selected using the purposeful sampling method, and the 8 games of this team were observed during 2008 K-league. The three indices were suggested. First, the Simple Index, which is the simple combination of all performance indicators, was developed. Next, the Weight Index, which is a combination of all performance indicators using the importance-weighted score from the delphi study, was developed. Lastly, the PCA Weight Index, which is the combination of all performance indicators with weights from the Principal Component Analysis(PCA), was suggested. The conclusions of this study is as follows: 1) According to the result of delphi study, 24 factors for the forward position, 31 for central midfielder position, 23 for external midfielder position, 21 for central defenders position and 21 for external defender position, which have influence on the soccer players’ performance during a match were extracted. 2) Based on the performance indicators that were extracted from the delphi study, the Simple Index, the Weight Index, and the PCA Weight Index were suggested. 3) Since the coefficient of variance of the PCA Weight Index is higher than the Weight Index, discrimination power of the PCA Weight Index is superior. However, the PCA Weight Index shows some problems in terms of content validity because it gives negative scores to indicators that are proven important in the delphi study. 4) Compared to the rating system used in the England premier soccer league, the three indices introduced in this study are not easy to understand. However, the three indices were suggested to have heightened discriminatory power. While the existing rating system tends to give higher scores to the forward position players, the newly suggested indices make it possible to score the player based on their performance, not their position.