Reference Material - Material, sufficiently homogenous and stable with reference to specified properties,
which has been established to be fit for its intended use in measurement of nominal properties
(JCGM200:2008).
Relative Standard Deviation - (RSD or %RSD) is the absolute value of the coefficient of variation (
x
s /
). It
is often expressed as a percentage. A similar term that is sometimes used is the relative variance which is
the square of the coefficient of variation. The relative standard deviation is widely used to express precision
and repeatability.
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