Summary
During the period 1980–1986 a number of samples representing different kinds of food items were distributed to about thirty laboratories for analysis. The objective was to test the laboratories with respect to their analytical skill in proximate analyses. Towards the end of the period the condition for analyses and the statistical technique had been developed in such a way that variations could be estimated within laboratories (repeatability) as well as between laboratories (reproducibility). An ellipse was constructed so that the probability for a randomly selected laboratory to fall within the ellipse would be 95%. This presentation also gives an example of wether mean values and standard deviations for a specific item change depending on the time between two courses of analysis.
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Torelm, I. Swedish interlaboratory trials on proximates and certain macro minerals. Z. Anal. Chem. 326, 699–701 (1987). https://doi.org/10.1007/BF00473533
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DOI: https://doi.org/10.1007/BF00473533