The relative age effect in a professional football club setting

@article{Mujika2009TheRA,
  title={The relative age effect in a professional football club setting},
  author={I{\~n}igo Mujika and Roel Vaeyens and Stijn Matthys and Juanma Santisteban and Juan Jos{\'e} Goiriena and Renaat Philippaerts},
  journal={Journal of Sports Sciences},
  year={2009},
  volume={27},
  pages={1153 - 1158}
}
Abstract The relative age effect is an uneven distribution of birth date favouring subjects born in the initial months of a selection year. This study compared the birth-date distributions between several subgroups of Basque football players to identify whether the relative age effect is influenced by age and/or skill level. The study comprised 13,519 players including 114 senior professionals from the Spanish league's AC Bilbao over 21 seasons; over the season 2005–2006, it comprised elite… 

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