MEASUREMENT UNCERTAINTY Continued...
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| Measurements |
Definition:
The uncertainty of a measurement tells us something about its quality. Uncertainty of measurement is the doubt that exists about the result of any measurement. [Measurement Good Practice Guide Title “A Beginner's Guide to Uncertainty of Measurement” by Stephanie Bell]
Definition: As per JCGM 100:2008 (GUM 1995 with minor corrections):
2.2 The term “uncertainty”: The concept of uncertainty is discussed further in Clause 3 and Annex D.
2.2.1 The word “uncertainty” means doubt, and thus in its broadest sense “uncertainty of measurement” means doubt about the validity of the result of a measurement. Because of the lack of different words for this general concept of uncertainty and the specific quantities that provide quantitative measures of the concept, for example, the standard deviation, it is necessary to use the word “uncertainty” in these two different senses.
2.2.2 In this Guide, the word “uncertainty” without adjectives refers both to the general concept of uncertainty and to any or all quantitative measures of that concept. When a specific measure is intended, appropriate adjectives are used.
2.2.3 The formal definition of the term “uncertainty of measurement” developed for use in this Guide and in the VIM [6] (VIM:1993, definition 3.9) is as follows: uncertainty (of measurement) parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand
