Uncertainty

Type A Evaluation of Uncertainty

Type A evaluation of uncertainty is the estimation of variance of the data obtained by direct measurements.(Type A Uncertainty) Normal
metrology

Uncertainty

The uncertainty of measurement characterizes the dispersion of the values that could reasonably be attributed to the stated value of
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Functional Relationship and Input Quantities

Functional Relationshipو The input quantities X1, X2, X3, …, Xn are themselves measured quantities which may further depend upon some
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mathematical modeling

Quite often the quantity under measurement (measurand) Y is not measured directly, but is the result of measurement of several