5. Our advice
5.1 Distinguish between elementary uncertainties
In the phase of evaluating elementary uncertainties, identify those which will have a very small impact on the final result, because their weight in the overall uncertainty is low. For example, when calculating the quadratic sum, (0.1) 2 will be negligible compared with (0.9) 2 . This observation can also be used to identify, on the contrary, a possible elemental uncertainty that is much greater than all the others. The final result will be very close to this uncertainty.
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Bibliography
GUM uncertainty evaluation method . Marc Priel ; Article III-20-11. Bivi métrologie Afnor
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