Knowra Accuracy (measurement science) Accuracy (measurement science) Accuracy is the closeness of a measured value to the true value of the quantity being measured. It describes agreement with a reference, not the consistency of repeated measurements.
Measurement : The process of assigning values to properties of objects or events according to defined procedures. Accuracy is a property of a measurement result, assessed against a reference value.
Precision (measurement science) : The closeness of agreement among repeated measurement results under specified conditions. Repeated results can be tightly grouped yet remain far from the true value.
Systematic error : A component of measurement error that remains constant or varies predictably across repeated measurements. A persistent offset can make precise results inaccurate.
International System of Units : The internationally agreed system of measurement units, abbreviated SI. Shared units let measurements be compared against common references.
Measurand : The quantity intended to be measured. A result cannot be judged accurate until the quantity it is meant to represent is specified.
Repeatability : Measurement precision under repeatability conditions, including the same procedure, operator, instrument, location, and short time interval. It captures one specific form of consistency, not closeness to a reference.
Random error : A component of measurement error that varies unpredictably across repeated measurements. Random variation affects how confidently closeness to a reference can be assessed.
Reference material : A material sufficiently homogeneous and stable for specified properties to be used in measurement or testing. Its characterized properties provide practical benchmarks for evaluating measurement results.
True value : The value of a quantity that would be obtained by a perfect measurement, though it is generally unknowable in practice. Accuracy is defined by closeness to this ideal reference.
Reproducibility : Measurement precision under changed conditions, such as different laboratories, operators, or instruments. It tests agreement across changed conditions rather than trueness.
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