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Gage R&R (GRR)

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An estimate of the combined variation of repeatability and reproducibility for a measurement system. The GRR variance is equal to the sum of within-system and between-system variances.

Synonyms:
gauge repeatability and reproducibility
  • Effective resolution
    The size of the data category when the total measurement system variation. This is determined by the length of the confidence interval based on the measurement system variation. The number of distinct categories (ndc) can be determined by dividing the size into the expected process distribution spread. For the effective resolution, a standard estimate of the ndc (at the 97% confidence level) is 1.41[PV/GRR]. (See Wheeler, 1989, for an another interpretation.)
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