The stability of 57 consensus values in a proficiency test material re-issued blind after an interval of 18 years†,Analytical Methods

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The stability of 57 consensus values in a proficiency test material re-issued blind after an interval of 18 years†
Analytical Methods ( IF 2.7 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1039/c8ay00093j
Michael Thompson _{1,

2,

3} , Peter C. Webb _{3,

4,

5,

6} , Philip J. Potts _{3,

4,

5,

6} , Stephen Wilson _{7,

8,

9,

10}

Affiliation

In 2017 a silicate rock test material was re-issued in the geoanalytical proficiency test GeoPT after an interval of 18 years. The second distribution was participant-blind. Consensus values (for each analyte for which measurements were submitted by a sufficient number of participants) were compared and tested for significant difference in location. Such an experiment can provide information about the stability of both the test material and—the main focus of the present paper—the assigned values, which are consensus values as estimated location parameters. The validity of a consensus as an assigned value in proficiency testing has often been questioned in metrological thinking although there is seldom a practicable alternative. Over the whole suit of analytes, there was no indication of change in the location estimates. This is a remarkable finding, given the incidental changes that had occurred between the two rounds of the proficiency test, especially (a) changes in the analytical technology used, (b) the turnover in participant laboratories, and (c) the large increase in emphasis on data quality in the intervening period.

中文翻译：

在间隔18年后重新发布的能力测试材料中的57个共识值的稳定性†

2017年，在地球分析能力测试Geo PT中重新发布了硅酸盐岩石测试材料间隔18年后。第二个分布是参与者盲。比较共识值（对于由足够多的参与者提交测量结果的每种分析物），并测试位置的显着差异。这样的实验可以提供有关测试材料和本论文主要关注点的稳定性的信息，这些值是作为估计位置参数的共识值。尽管很少有可行的替代方法，但在计量学思维中经常质疑将共识作为能力验证中指定值的有效性。在整个分析物系列中，位置估计值没有变化的迹象。这是一个了不起的发现

更新日期：2018-03-07

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