random error

(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

References: 

(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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