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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 (if not correlated).
5.2
2
2
c
N
i
f
u
u ( x )
x
∂
= +
⋅
∂
∑
f
x
∂
∂
= sensitivity
74
1
i
i
=
i
factor