Proficiency tests with uncertainty information: Extension of the En number for cases with no reference laboratory. (April 2016)

• Record Type: Journal Article
• Authors: Shirono, Katsuhiro; Shiro, Masanori; Tanaka, Hideyuki; Ehara, Kensei
• Is Part Of: Measurement. Volume 83(2016:Apr.)
• Page Start: 135
• Page End: 143
• Publication Date: 2016-04
• Subjects: Interlaboratory comparison -- Performance evaluation -- Bayesian posterior predictive check -- ISO 13528; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2015.09.035
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: The performance evaluation method in PTs with uncertainty information is developed. The E n number, described in ISO 13528, is reinterpreted and extended in this study. This extended E n number has clear statistical meaning and is easy to compute. Abstract: When measurement uncertainties are reported in a proficiency test (PT), the performances are usually evaluated through a comparison with the measurement result of a reference laboratory as set forth in the ISO 13528 standard. On the other hand, the standard does not specify a performance evaluation method when there is no reference laboratory. In this study, the E n number, which is described in ISO 13528 as one of the performance statistics, is reinterpreted as an index for Bayesian posterior predictive checking, and extended to a case with no reference laboratory. This extended E n number proposed in this study has clear statistical meaning and is easy to compute.