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The determination of the uncertainty of a result therefore

requires an analysis of the

distribution

of any influence quantity.

All components to the overall uncertainty are grouped into

two

different categories

according to

how the associated

probability distribution is being evaluated

:

More on the uncertainty concept:

Type A (evaluation of)

uncertainty:

Those components which

are evaluated by

statistical analysis of

repeated of observations

Type B (evaluation of)

uncertainty:

Those components which are

evaluated by any other

means

16

Both based on probability

distributions

NOT Random and

Systematic errors!