Accuracy is a qualitative indication of how closely the result of a measurement agrees with the true value of the parameter being measured.  VIM, 3.5) Because the true value is always unknown, accuracy of a measurement is always an estimate. An accuracy statement by itself has no meaning other than as an indicator of quality. It has quantitative value only when accompanied by information about the uncertainty of the measuring system. Contrast with: accuracy (of a measuring instrument)

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