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Next we have to determine the estimates for the corresponding uncertainties
u(x
i
).
GUM says: The uncertainties are grouped into
two different categories
Type A and B evaluation
according to the method
how the uncertainty is being evaluated
:
Type A evaluation:
refers to those input
quantities which are
Type B evaluation :
refers to those input quantities
which are evaluated by other
77
evaluated by statistical
analysis of series of
observations
means