| Zugriffsnummer | 34501 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Pass / Fail / inconclusive criteria for inter-laboratory comparisons |
| Autor(in); Institution |
Wright, John; National Institute of Standards and Technology (NIST), USA
Blaza, Toman; National Institute of Standards and Technology (NIST), USA
Mickan, Bodo; 1.4, Gase, PTB-Braunschweig
Wübbeler, Gerd; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Bodnar, Olha; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Elster, Clemens; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
|
| Quelle/Jahr | Proceedings of the 9th International Symposium on Fluid Flow Measurement (ISFFM):(2015), 20 S. |
| Availability | [Online only] |
| URL | |
| Konferenzangaben | International Symposium of Fluid Flow Measurement ISFFM 2015, Arlington, 14-17, April, 2015, USA |
| Freie Schlagworte | Key comparison ; CMC evaluation ; Measurement Uncertainty ; degree of equivalence ; criteria ; transfer standard |
| Zusammenfassung | Inter-laboratory comparisons use the best available transfer standards to check participants uncertainty analyses, identify underestimated uncertainty claims or measurement errors, and improve the global measurement system. For some measurands instability of the transfer standard can lead to an inconclusive comparison result. If the transfer standard uncertainty is large relative to a participating laboratorys uncertainty, the commonly used standardized degree of equivalence Eni ≤1 criterion does not always correctly assess whether a participant is working within its uncertainty claims. We show comparison results that demonstrate the problem and discuss the "loss of explanatory power" in terms of statistical hypothesis tests. We propose several criteria for assessing a comparison result as passing, failing, or inconclusive and investigate the behaviour of En and alternative comparison measures for a range of di/ulab i and uTS/ulab i values. Two of them (Criteria C and D) successfully discerned between passing failing, and inconclusive comparison results for the cases we examined. |
