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The Long‐Term Robustness and Stability of Consensus Values as Composition Location Estimators for a Typical Geochemical Test Material in the GeoPT Proficiency Testing Programme

Webb, Peter C.; Potts, Philip J.; Thompson, Michael; Wilson, Stephen A. and Gowing, Charles J.B. (2019). The Long‐Term Robustness and Stability of Consensus Values as Composition Location Estimators for a Typical Geochemical Test Material in the GeoPT Proficiency Testing Programme. Geostandards and Geoanalytical Research (Early Access).

DOI (Digital Object Identifier) Link: https://doi.org/10.1111/ggr.12263
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Abstract

Re-issuing the same test material, its true identity unknown to participants, in two rounds of the GeoPT proficiency testing programme 18 years apart has demonstrated remarkable similarity, and therefore stability, of consensus values independently estimated for over fifty measurands in each round. A comparison of the two datasets, GeoPT5 (AMH-1) in 1999 and GeoPT41 (ORA-1) in 2017, shows that corresponding consensus values, rigorously derived by current procedures for complete compatibility, are for the most part statistically indistinguishable when account is taken of their associated uncertainties. Inferences that may be drawn from this exceptional agreement include: (a) the consensus estimation procedure was robust and gave consistent results; (b) overall, the balance of the contributed data was unaffected by significant changes in: (i) the populations of laboratories participating, (ii) the proportions of laboratories producing results by different techniques, (iii) the manner in which systems were calibrated, or (iv) the aspirations of laboratories to attain higher quality results over time; and (c) unsurprisingly perhaps, that the test material itself had remained stable and unchanged during that time. Additionally, a statistical comparison of the original values for AMH-1 with consensus values derived by current procedures demonstrates that they are also effectively indistinguishable.

Item Type: Journal Item
ISSN: 1751-908X
Keywords: GeoPT; proficiency testing; consensus values; long-term stability; andesite AMH-1
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 60349
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 09 Apr 2019 09:51
Last Modified: 13 May 2019 16:01
URI: http://oro.open.ac.uk/id/eprint/60349
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