Elster, C*; Wöger, W*; Cox, M G
(2005)
*Analysis of key comparison data: unstable travelling standards.*
Izmer. Tekh., 9.
pp. 33-39.

## 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.

Item Type: | Article |
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Keywords: | deterministic drift, random drift, parametric model, linear trend, random walk, least squares, consistency check, star-shaped design |

Subjects: | Mathematics and Scientific Computing Mathematics and Scientific Computing > Measurement Uncertainties |

Last Modified: | 02 Feb 2018 13:16 |

URI: | http://eprintspublications.npl.co.uk/id/eprint/3826 |

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