The present statistical procedure describes how to check results for absence of bias by comparison of these
analytical results with those obtained during the certification of CRMs.
If the resulting data confirm the absence of bias, the method may be considered accurate when applied to all
steels and irons whose composition ranges are adequately covered or bounded by the CRMs used.
The resulting data give also an estimate of the repeatability and/or the intermediate precision ("intralaboratory
reproducibility") for the CRMs used. The comparison of these analytical data with the repeatability data
obtained during the certification may also be performed depending on the strict purpose of the method under
consideration.