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Unequal Competition as an Impediment to Personal Development: A Review of the Relative Age Effect in Sport

Jochen Musch, Simon Grondin. Developmental Review 21(2), 2001, 147-167.

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peer-reviewed
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article
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The founding review of the relative age effect, and the reason this site can say something true about a birth date. The mechanism it frames is annual age-grouping by an administrative cutoff, found across many sports and many countries.

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The Relative Age Effect
For the founding review and the age-grouping-cutoff mechanism.