Processing of several groups of direct measurements with multiple observations.

The article deals with the processing of interlaboratory tests, a specific measurement model arises, called the nested structure. A feature of these measurements is that they are carried out at different times, by different measuring instruments, under different conditions, by different methods, by different operators. In this case, several groups of direct measurements with multiple observations are formed, which, in order to reduce uncertainty, should be combined, obtaining a single measurement result. [ABSTRACT FROM AUTHOR]

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