Dose Course 2018_Flipping book

5.2

Combined uncertainty

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)

2

N

f x



 

f

2



u

u ( x )

= +

i       x

= sensitivity coefficient

c

i



i

i

1

=