In metrology, **measurement uncertainty** is a non-negative parameter characterizing the dispersion of the values attributed to a measured quantity. The uncertainty has a probabilistic basis and reflects incomplete knowledge of the quantity. All measurements are subject to uncertainty and a measured value is only complete if it is accompanied by a statement of the associated uncertainty. Fractional uncertainty is the measurement uncertainty divided by the measured value.

Codex has guidelines on Measurement Uncertainty, CAC/GL 54-2004.

Read more about Measurement Uncertainty: Background, Random Errors and Systematic Errors, GUM Approach, Measurement Model, Propagation of Distributions, Type A and Type B Evaluation of Uncertainty, Sensitivity Coefficients, Stages of Uncertainty Evaluation, Models With Any Number of Output Quantities, Joint Committee For Guides in Metrology, Alternative Perspective

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### Famous quotes containing the words uncertainty and/or measurement:

“I think the worst thing this nation could do for humanity would be to leave any *uncertainty* as to our will, our purpose and our capacity to carry out our purpose.”

—Hubert H. Humphrey (1911–1978)

“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the *measurement* of future events and they never are, if you have high standards of accuracy.”

—John Dos Passos (1896–1970)