8.22 Conclusions
153
Fig. 8.5 Result with
accompanying uncertainty
close to the decision limit
upper
allowed limit
I
II
III
IV
Cases 2 and 3
The measurement result with the assigned uncertainty includes the decision value
in its range. In both cases, it is therefore important to define the decision-making
criteria beforehand.
If the criterion will be the mean value without the assigned uncertainty, then case 2
should follow case 1 (the sample does not meet the requirements), and case 3 should
follows case 4 (the sample meets the requirements).
If the criterion will be the result with the assigned uncertainty, then for case 2
and 3, that decision will mean that the sample meets the requirements. In both cases,
however, it will be necessary to establish beforehand what legal consensus applies
to it, how often can such a situation occurs and what further actions will be taken by
the decision-making body. More information on the subject of the meaning of the
uncertainty value in decision-making can be found in Ellison S.L.R. and Williams
A. (Eds). Eurachem/CITAC guide: Use of Uncertainty Information in Compliance
Assessment, First Edition (2007); available from www.eurachem.org.
153
Fig. 8.5 Result with
accompanying uncertainty
close to the decision limit
upper
allowed limit
I
II
III
IV
Cases 2 and 3
The measurement result with the assigned uncertainty includes the decision value
in its range. In both cases, it is therefore important to define the decision-making
criteria beforehand.
If the criterion will be the mean value without the assigned uncertainty, then case 2
should follow case 1 (the sample does not meet the requirements), and case 3 should
follows case 4 (the sample meets the requirements).
If the criterion will be the result with the assigned uncertainty, then for case 2
and 3, that decision will mean that the sample meets the requirements. In both cases,
however, it will be necessary to establish beforehand what legal consensus applies
to it, how often can such a situation occurs and what further actions will be taken by
the decision-making body. More information on the subject of the meaning of the
uncertainty value in decision-making can be found in Ellison S.L.R. and Williams
A. (Eds). Eurachem/CITAC guide: Use of Uncertainty Information in Compliance
Assessment, First Edition (2007); available from www.eurachem.org.