3. How to use loyalty values
Once the fidelity parameters have been calculated, two important questions can be answered.
For end-users who use analyses in their trade: what is the maximum acceptable difference between tests carried out by two different laboratories?
For analysts who want to know whether their method is "good" or not: is the fidelity obtained acceptable?
3.1 Repeatability and reproducibility limits
The concepts of repeatability limit (noted r ) and reproducibility limit (noted R ) help to answer the first question. To understand the practical use of these criteria, let's consider two laboratories, A and B, using the same standardized ICP-MS lead assay method. This method has...
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