Statistical Treatment of Proficiency Testing Data and Guidelines
Explore standards and guidelines for statistical treatment of proficiency testing data, including ISO standards, IUPAC protocols, and methods for determining assigned values, SDPA, and reporting performance statistics.
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Presentation Transcript
Standards and Guidelines for the statistical treatment of PT data
Standards and guidelines for providing PT / EQA schemes a) ISO 13528:2022 - Statistical Methods for use in Proficiency Testing by Interlaboratory comparisons b) IUPAC Technical Report 1/2006 - The International Harmonized Protocol for the Proficiency Testing of Analytical Chemistry Laboratories c) ISO/TS 20612:2007 - Water Quality Interlaboratory comparisons for proficiency chemistry laboratories testing of analytical d) ISO/IEC 17043:2023 - Conformity Assessment General Requirements for Proficiency Testing 2 20-03-2025 S.SUBRAMANIAN
Standards and guidelines for providing PT / EQA schemes e) ISO 17034:2016 - General requirements for the competence of reference material producers f) ISO-Guide 35: 2017 - Reference materials General and statistical principle for certification g) ISO 5725-1 to -6 - Accuracy (trueness and precision) of measurement methods and results h) ISO 22117 - Microbiology of the food chain Specific requirements and guidance for proficiency testing by interlaboratory comparison 3 20-03-2025 S.SUBRAMANIAN
ISO 13528:2022 - Statistical Methods for use in Proficiency Testing by Interlaboratory comparisons 5 ways to determine the Assigned Value with more emphasis on its uncertainty Formulation, certified reference material, results from one laboratory, consensus from expert laboratories, consensus from participants 5 ways to determine the SDPA perception of experts, by experience from prom previous PT rounds, from a general model, from results of a precision experiment, from data in a round of a PT scheme 7 ways to report Performance statistics Deviation, percent deviation, z-scores, En-numbers, z -scores, Zeta-scores, PA score 4 20-03-2025 S.SUBRAMANIAN
ISO 13528:2022 - Statistical Methods for use in Proficiency Testing by Interlaboratory comparisons Preferred calculation standard deviation: Algorithm A. Described in Annex C (normative) and also in ISO 5725-5:1998 statistical of method for the and consensus mean but methods, provided that they have a sound statistical basis also allowed: Other calculation 5 20-03-2025 S.SUBRAMANIAN
IUPAC Technical Report 1/2006 - The International Harmonized Protocol for the Proficiency Testing of Analytical Chemistry Laboratories Several ways to determine Assigned Value, but the provider must report an uncertainty to the participants for calculation of consensus mean Alg. A (called H15 here) is recommended, but with a check, if the distribution is unimodal Performance statistics - only the use of z-scores is recommended Determination of the SDPA - Only value determined by fitness-for-purpose is recommended. 6 20-03-2025 S.SUBRAMANIAN
ISO/IEC 17043: 2023 - ANNEX B STATISTICAL METHODS FOR PT (Informative) B.1. General B.2 Assessment of PT item homogeneity & stability B.3 Determination of the Assigned Value and its uncertainty B.4 .1 Calculation of Performance statistics - Performance for quantitative results B.4.2 Calculation of performance statistics - Performance for nominal and ordinal results B.5 Evaluation of performance 7 20-03-2025 S.SUBRAMANIAN
