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📏 Repeatability / Reproducibility Limit (r/R)
GB/T 6379 / ISO 5725 approach: range of replicate / inter-laboratory results vs r and R
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Repeatability (parallel results within one lab, two values per line)
Reproducibility (results of two labs / two conditions, two values per line)
Decision logic (GB/T 6379 / ISO 5725)
· Repeatability standard deviation s_r = √(Σd²/2n), repeatability limit r = 2.83·s_r; a pair is acceptable when |difference| ≤ r.
· Reproducibility: use the two-laboratory differences d to obtain s_R, R = 2.83·s_R; |difference| ≤ R is acceptable.
· Used for precision verification, intermediate checks, and initial agreement judgement of inter-laboratory comparisons.
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About Repeatability & Reproducibility Limits (ISO 5725)

ISO 5725 repeatability limit r and reproducibility limit R: compute critical differences from precision data and judge whether two results agree.

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