Precision of measurement is the closeness of agreement between independent results of measurements obtained under stipulated conditions [SOURCE: ISO 3534-1:1993, 3.14]. Precision of measurement cannot be given a numerical value in terms of the measurand, only descriptions such as 'sufficient' or 'insufficient' for a stated purpose. The degree of precision is usually expressed numerically by the statistical measures of imprecision of measurements, such as standard deviation and coefficient of variation, that are inversely related to precision. "Precision" of a given measurement procedure is subdivided according to the specified precision conditions. "Repeatability" relates to essentially unchanged conditions and is often termed "withinserial" or "within-run precision". "Reproducibility" relates to changes in conditions, e.g. time, different laboratories, operators, and measuring systems (including different calibrations and reagent batches).
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- Precision of a method is the degree of agreement among individual test results when the procedure is applied repeatedly to multiple samplings. Precision is fundamentally different from accuracy. - Paul WL (1991) USP perspectives on analytical methods evaluation. Pharm Technol 15:130-41.