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Estimating Within-Laboratory Variability From Interlaboratory Test Data

Summary: Replicate measurements on a single sample are commonly used to obtain a measure of repeatability. If conditions that are normally allowed to vary within a laboratory are held fixed while making the replicate measurements, the resulting estimate of repeatability may not be a valid measurement of within-laboratory variability. Suggestions for obtaining valid estimates in a certain situation are given and applied to an example concerned with interlaboratory testing.

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  • Topics: Laboratory
  • Keywords: Repeatability and reproducibility studies (R&R),Interlaboratory comparisons,Variance (statistics)
  • Author: Jaech, John L.
  • Journal: Journal of Quality Technology