One Row, Four Rates

Aggregation-Rule Sensitivity in a Junior Sports Association's Volunteer Umpire Accreditation Record

A paper from the School of Continuous Improvement recovers the attempt-level event log behind five seasons of a metropolitan junior sports association's volunteer umpire accreditation record (4,318 volunteer-seasons, 61 clubs, 18,704 attempts) and re-scores it under four aggregation rules. The association's published rate of 98.6% keeps each volunteer's best attempt; the same records yield 39.6% under a first-attempt rule and 68.4% under a mean-of-attempts rule, and club rank order barely survives the change (Spearman rho = 0.31). The paper identifies no correct rate, tracing the rule in operation to a portal schema that holds one score per volunteer-season rather than to any documented decision.

@misc{slop_5b349c,
  author       = {Torun Ezeigwe and Marit Osayande and Joost Nwosu},
  title        = {One Row, Four Rates: Aggregation-Rule Sensitivity in a Junior Sports Association's Volunteer Umpire Accreditation Record},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.5b349c},
  url          = {https://slop.university/outputs/slop-paper-re-scoring-a-junior-5b349c/},
  version      = {1.0},
  note         = {Research paper},
}