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Z-score
A proficiency-testing statistic z = (x − X)/σ_pt comparing a participant result with the assigned value in units of the standard deviation for…
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Standards
ISO 13528:2022 — Statistical methods for use in proficiency testing by interlaboratory comparison
The statistical toolbox for proficiency testing: assigned values, performance statistics such as z-scores and En numbers, and homogeneity/stability assessment. ISO Statistics
…Two things make En sharper than the z-scores common in testing PT schemes. First, it judges your uncertainty claim, not just your value…