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Influence quantity
Quantity that is not the measurand but that affects the result of the measurement.
Result of Measurement
Value attributed to a measurand, obtained by measurement.
Notes:
a. When a result is given, it should be made clear whether is refers to:
i. the indication
ii. the uncorrected result
iii. the corrected result and whether several values are averaged
b. A complete statement of the result of a measurement includes information about the uncertainty.
Uncorrected result
Result of a measurement before correction for systematic error.
Corrected result
Result of a measurement after correction for systematic error.
Accuracy of measurement
Closeness of the agreement between the result of a measurement and a true value of the measurand.
Notes:
a. “Accuracy” is a qualitative concept.
b. The term precision should not be used for “accuracy”.
Repeatability (of results of measurements)
Closeness of the agreement between the results of successive measurements of the same measurand
carried out under the same conditions of measurement.
Notes:
a. These conditions are called repeatability conditions.
b. Repeatability conditions include:
i. the same measurement procedure
ii. the same observer
iii. the same measuring instrument, used under the same conditions
iv. the same location
v. repetition over a short period of time
c. Repeatability may be expressed quantitatively in terms of the dispersion characteristics of the
result.
Reproducibility
Closeness of the agreement between the results of measurements of the same measurand carried
out under changed conditions of measurement.
Notes:
a. A valid statement of reproducibility requires specification of the conditions changed.
b. The changed conditions may include:
i. principle of measurement
ii. method of measurement
iii. observer
iv. measuring instrument
v. reference standard
vi. location
vii. conditions of use
viii. tim e
c. Reproducibility may be expressed quantitatively in terms of the dispersion characteristics of the
results.
d. Results are here usually understood to be corrected results.
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