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Handling false negatives, false positives and reporting limits in analytical proficiency tests



Handling false negatives, false positives and reporting limits in analytical proficiency tests



Analyst 122(5): 495-497



The Harmonised Protocol on proficiency testing produced by ISO, IUPAC and AOAC International recommends that participants' results on interval or ratio scales are converted to z-scores for assessment. When proficiency tests are conducted with materials that contain little or no analyte (simulating real conditions in residue analysis) scheme organisers have reported difficulty with applying the z-scoring system when false negatives and false positives occur. This paper concludes that the z-scoring system is adaptable without change to false negatives and positives, although a degree of statistical expertise is called for.

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Accession: 046211422

Download citation: RISBibTeXText

PMID: 9246820

DOI: 10.1039/a701411b


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