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The role of viewing distance and viewing angle on referees' decision-making performance during the FIFA World Cup 2014.
Journal of Sports Sciences 2019 Februrary 5
The present study aims to reveal the effects of positioning on decision-making performance in top-level refereeing in association football. To this end, for all 64 matches of the FIFA World Cup 2014, potential foul-play situations were videometrically analysed in terms of the referee's position relative to the infringement. Contrary to earlier studies, viewing angles were analysed in addition to viewing distances and error rates were considered for not only falsely whistled but also falsely non-whistled events. Moreover, direct logistic regression analysis was applied to detect position-dependent differences. For the total of 1,527 potential foul play situations, an overall low error rate of 6.9% was found. The similar numbers of total whistle (n = 52) and non-whistle errors (n = 54) reflect referees' ability to balance both types of errors. Regarding the overall viewing-distance effect, referees were 2.58 times (95% CI 1.47-4.54) more likely to commit a whistle error at 10-15 m and 5.51 times (95% CI 1.35-22.47) more likely to commit a non-whistle error at 0-5 m, corresponding to the position ranges occurring with the highest (10-15 m: 30.3%) and lowest (0-5 m: 5.8%) frequencies. In contrast, no significant effects of viewing-angle on decision-making accuracy could be revealed.
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