Definitions

Accuracy of measurement

The closeness of the agreement between the result of a measurement and a true value of the measurand

Precision

The closeness of agreement between independent test results obtained under stipulated conditions

Uncertainty (of measurement)

Parameter associated with the result of a measurement, that characterises the dispersion of the values that could reasonably be attributed to the measurand

Traceability

The property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties

Error (of measurement)

The result of a measurement minus a true value of the measurand

Random error

Result of a measurement minus the mean that would result from an infinite number of measurements of the same measurand carried out under repeatability conditions

Systematic error

Mean that would result from an infinite number of measurements of the same measurand carried out under repeatability conditions minus a true value of the measurand

Reference

EURACHEM / CITAC Guide CG 4. Quantifying Uncertainty in Analytical Measurement Second Edition.

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