能力验证结果稳健统计值与有证参考物质认定值的符合性比较研究

由于能力验证计划系依托"大样本"试验,正常情况下各实验室结果的稳健统计值应更逼近真值,据此可采用有证参考物质作为能力验证计划共同试验样品,依据能力验证结果的稳健统计值,用以比较验证有证参考物质的认定值的符合性。本文分别提出了两种评价方法:其一为能力验证结果稳健统计平均值与有证参考物质认定值间差值的不确定度评价方法。当能力验证结果的稳健统计平均值与有证参考物质认定值之差的绝对值不大于该差值的扩展不确定度时,可以认为该有证参考物质的认定值及其不确定度的评估合理;当能力验证结果的稳健统计平均值与有证参考物质认定值之差的绝对值大于该差值的扩展不确定度时,则应检查该认定值(或能力验证结果稳健统计平均值)可能存在的偏倚或其不确定度的评估是否偏小。其二为有证参考物质认定值的方法临界差评价方法。当有证参考物质的认定值与能力验证结果的稳健统计平均值之差的绝对值不大于具有最小重复性限及再现性限方法的临界差(CD0.95)与能力验证结果稳健统计平均值的方和根时,则表明该有证参考物质相关参数的认定值能满足所有已发布的相关标准方法对临界差的要求,可以用于相关质量控制或方法的评估。

Study on conformity comparison between the robust statistic value of proficiency testing results and the certified value of certified reference material

Since the proficiency testing schemes depended on numerous participants test,the robust statistic value of experimental results from laboratories under normal conditions is more close to the true value.Accordingly,the certified reference materials(CRMs) can be used as common testing samples for proficiency testing schemes,and the robust statistic value of proficiency testing(PT) results can be used for the comparison and verification of the conformity of certified value of CRMs.In this paper,two evaluation ...