Abstract: In this article, the models of random parameter and random walk are considered as alternative approaches for estimating the mean standard deviation associated with heterogeneity during both the evaluation of the metrological characteristics of reference materials, as well as the quality control of samples prepared from moist solid substances. For the random parameter and random walk models, the behaviour of the basic statistical criteria is described, including, overall mean, standard deviation, standard deviation of the mean and autocorrelatio...
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