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Statistical methods of uncertainty evaluation — Guidance on evaluation of uncertainty using two-factor crossed designs
ISO/TS 17503:2015 covers balanced two-factor designs with any number of levels. The basic designs covered include the two-way design without replication and the two-way design with replication, with one or both factors considered as random. Calculations of variance components from ANOVA tables and their use in uncertainty estimation are given. In addition, brief guidance is given on the use of restricted maximum likelihood estimates from software, and on the treatment of experiments with small numbers of missing data points.
Methods for review of the data for outliers and approximate normality are provided.
The use of data obtained from the treatment of relative observations (for example, apparent recovery in analytical chemistry) is included.
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