Title: Analysis of key comparison data: unstable travelling standards.
Author: Elster, C*, Wöger, W*, Cox, M G
(An asterisk (*) after an author's name indicates a non-NPL author)
Source: Measurement, 2005, 48, 883-893
Abstract: A procedure for the analysis of key comparison data is proposed in the case where the travelling standard shows a deterministic or random drift. It is assumed that some parametric model such as a linear trend is appropriate for modelling the deterministic part of the drift. The random part of the drift is assumed to be adequately described by a random walk model. The chosen drift model is determined by least squares and a model check is carried out. If the model check is satisfied the derived drift model is applied to determine degrees of equivalence. A star-type sequence is required for the comparison in order to check the adequacy of the random drift model. The procedure is illustrated by its application to simulated data.
Document Type: Periodical article
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