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The Magazine

Bio Banding: Solution to RAE?

Bio-banding. Is it the answer or just another challenge in RAE? In Player Development Project Magazine Issue #10, Cruyff Football and Ajax consultant Steve Lawrence gave some background to relative age effects, explaining why they occur and identifying the use of cut-off date rules as the causal culprit. Steve is at the forefront of research in this area, and in this follow-up article he explains the concept of bio banding and suggests how to solve the issue of relative age effects.

Concerns about relative age effects (RAE) tend to coalesce...

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  1. Peter R says:

    An extremely simple feedback measure which does not enforce quotas is to require all representative squad coaches to at the very least measure and record the birthdates of all players they select (in and out of “their” squad) and retrospectively note whether their selection priorities have produced an RAE – if so, perhaps the coach could then be asked to explore/explain why this might be the case?

  2. Steve L says:

    Yes – recording the birthdates provides two important metrics – one is the average age of the selection and the second is the relative age bias evident in the selection. I call these ATA (average team age) and RAEi (RAE index). Analysis of these metrics and the relationship they have to performance outcomes and to coach comments would be an interesting project.

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