8.2. Uncertainty components from a check standard
If the temporal component of the measurement process is evaluated from measurements on a check standard as described in sec. 2.5.2. and there are
M
days (
M = 1
is permissible) of measurements on the test item which are
structured in the same manner as the measurements on the check standard
, the standard deviation for the reported value is
The computation of the standard deviation from the check standard values and its relationship to components of instrument precision and day-to-day variability of the process are explained in sec. 2.5.2..
The sensitivity coefficients are:
a1 = 0
a2 =sqrt(1/M)
and the degrees of freedom are
v2 = K-1
from the
K
entries in the check standard database.
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