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A combined (standard) uncertainty is then obtained as the positive square
root of the
sum of variances
weighted according to how the result is
influenced by varying different influence components (only if not
correlated).
All uncertainties have to be in the same units (use relative uncertainty)
5.2
2
2
c
1
N
i
i
i
f
u
u ( x )
x
=
= +
i
f
x
= sensitivity
coefficient
Combined uncertainty