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Persistent URL http://purl.org/net/epubs/work/63696
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Record Id 63696
Title Uncertainty associated with numerical computation
Abstract The National Physical Laboratory is the UK's national metrology institute (NMI), responsible for de ning and disseminating standard units of measure- ment. The central goal of an NMI is to ensure that all measurement results are traceable to the same standard units. Traceability requires that measurement results can be linked to references (such as measurement units) through a doc- umented unbroken chain. A measure result has two components, an estimate of the quantity and an associated uncertainty. The two components allow us to say how far the estimate is likely to be from the `true value' (as determined by a more accurate measuring system, for example, if such exists). If the traceability the chain involves computation, as it does in almost all modern measuring sys- tems, it is necessary that all computational links are recognised explicitly and known to be operating correctly. This requirement for `traceable' computation has been recognised by the metrology community and a new project Traceability of computationally-intensive metrology, start date 1st June 2012, involving NPL and other European NMIs, is looking at how to provide such traceability. In this talk, I will will describe some of the concepts underlying this new project: the generation of reference data and reference results from an analysis of the optimality conditions associated with the computational task and the assignment of an uncertainty component associated with the computation.
Keywords NOBUGS2012
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Language English (EN)
Type Details URI(s) Local file(s) Year
Presentation Presented at NOBUGS 2012 (NOBUGS 2012), RAL, UK. Forbes-NOBUGS-2012.pdf 2012