A round of thirty-six arrows measures an archer's level reliably enough

A round of thirty-six arrows measures an archer's level reliably enough · What changed https://matteocampagna.com/en/registry/competition/36-arrow-test-reliability Changes to this claim in Matteo Campagna's evidence registry: its status, its year-by-year history, revisions of the page. en-gb Claim page revised, version 3https://matteocampagna.com/en/registry/competition/36-arrow-test-reliabilityThere is little on this question, and what there is comes second-hand. Two Indonesian training studies, from 2022 and 2024, use a round of 36 arrows at 30 m, out of a maximum of 360, as their accuracy test and credit it with the same reliability, 0.825: the first calls it test-retest, the second Cronbach's alpha, which measures the internal consistency of the test rather than its stability from one day to the next. In neither is the coefficient calculated on the study's own sample, twenty young or club archers in both cases: the first does not say where it comes from, and it appeared in a journal with questionable editorial standards; the second cites it from earlier work by the same group, where that figure does not appear. Even taken at face value, a coefficient of 0.825 leaves a margin of error that neither study expresses in points. Two studies that do not measure repeatability across archers give the scale of that margin. A 2020 model, for a top compound archer at fifty metres with the sight set correctly, gives 36 arrows a standard deviation of 2.7 points from one round to the next, enough to mask small improvements. And a 2023 laboratory study shows how wide that margin is for a single archer: for an advanced barebow archer at 50 m, the authors' simulation gives a 30-arrow round a standard deviation of about six points, and a stable average would take between 900 and 1,050 arrows. A round of thirty-six arrows may therefore be enough to separate archers of very different levels, but nobody has measured how repeatable it is for reading differences of a few points. A coefficient that is cited rather than calculated on a study's own sample is not a measurement, and so the status is not studied.claim:test-36-frecce-affidabile:revision:2026-04-10:3Fri, 10 Apr 2026 08:00:00 GMT "A round of thirty-six arrows measures an archer's level reliably enough" added to the registry as Not studiedhttps://matteocampagna.com/en/registry/competition/36-arrow-test-reliabilityclaim:test-36-frecce-affidabile:new_claim:2026-03-03:non_studiatoTue, 03 Mar 2026 08:00:00 GMT