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Evaluation of type B uncertainties

The ISO Guide states that
For estimate $ x_i$ of an input quantity6.3 $ X_i$ that has not been obtained from repeated observations, the $ \ldots$ standard uncertainty $ u_i$ is evaluated by scientific judgement based on all the available information on the possible variability of $ X_i$. The pool of information may include

Giulio D'Agostini 2003-05-15