Interlaboratory comparison of categorical characteristics of a substance, material, or object |
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| Ilya Kuselman, Tamar Gadrich, Francesca R. Pennecchi, D. Brynn Hibbert, Anastasia A. Semenova, Angelique Botha |
- Abstract:
- When a reference value for the measurand in an interlaboratory study is unknown, the laboratory results may be used to estimate/build a consensus value instead of a reference value. Since no algebraic operations and mathematical functions exist among categorical (nominal and ordinal) values, a numerical consensus value cannot be formulated. Consensus of responses of experts of different laboratories participating in an interlaboratory comparison, classifying a substance, material, or object according to its nominal and ordinal characteristics, could be interpreted as the degree to which the experts agree. Two-way factorial analysis of variation of nominal variables CATANOVA and of ordinal variables ORDANOVA answer the question ‘is a consensus of participating laboratories achieved or not?’ The answer is based on testing hypotheses about homogeneity of the between- and within-laboratory variation components, as well as the variation components caused by other factors under study.
- Download:
- IMEKO-TC8-11-24-2025-029.pdf
- DOI:
- 10.21014/tc8-2025.029
- Event details
- IMEKO TC:
- TC8
- Event name:
- IMEKO TC8, TC11 and TC24 Conference
- Title:
Joint conference of the TCs ‘Traceability in Metrology’ (IMEKO TC8), ‘Measurement in Testing, Inspection and Certification’ (IMEKO TC11), and ‘Chemical Measurements’ (IMEKO TC24).
- Place:
- Torino, ITALY
- Time:
- 14 September 2025 - 17 September 2025