(1) component of measurement error that in replicate measurements varies in an unpredictable manner; note that random measurement error equals measurement error minus systematic measurement error.
Note: Random measurement errors of a set of replicate measurements form a distribution that can be summarized by its expectation, which is generally assumed to be zero, and its variance.
(2) component of forecast error that varies in an unpredictable manner
(1) Joint Committee for Guides in Metrology (JCGM/WG 2) 200:2012 & ISO/IEC Guide 99-12:2007, International Vocabulary of Metrology – Basic and General Concepts and Associated Terms (VIM), http://www.bipm.org/en/publications/guides/vim.html
(2) Lambert, J.-C., MACC II Service Validation Protocol, EC FP7 MACC-II Deliverable D153.1, May 2013, http://www.gmes-atmosphere.eu/documents/maccii/deliverables/man/MACCII_M...
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