ENBIS-15 in Prague

6 – 10 September 2015; Prague, Czech Republic Abstract submission: 1 February – 3 July 2015

Pre-Conference Workshop on "Measuring Uncertainty in the GUM (VIM) vs ISO 5725 (ISO 3534) Approaches: Which Statistical Viewpoint to Choose?" with IMEKO TC21 by Robin Willink and Franco Pavese

6 September 2015, 09:30 – 12:30

This half-day ENBIS-15 pre-conference workshop will be given by Rob Willink (New Zealand) and Franco Pavese (Italy), both from IMEKO TC21.

The workshop is suitable for statisticians, engineers and managers who are responsible for activities involving the analysis of data during any stage of the processing of technical products, as well as academics interested in the topic.

During the workshop participants will learn the different meanings given to "uncertainty" in quantitative measurements, and to systematic and random measurement error, or to Type A and Type B uncertainty, respectively in the GUM and in the ISO (with the necessary reference to VIM and to ISO 3534, respectively, for the terminology). These come from two different approaches in statistics.

The first, today often called ‘traditional’ is the historical “error approach” using a ‘true value’ as a reference. It is still almost universally adopted by ISO standards and generally used in testing and non-quantitative measurements.

The second is an approach basically born in the metrological fields in the ‘80s of the past century, called “uncertainty approach” not using the concept of true value, and adopted in GUM as a Guideline prepared by the BIPM Committee,  with participation of representatives from a number of International Organisms (BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, and OIML). Is is used basically in metrology.

Another possible approach is the Bayesian as opposed to the frequentist (or fiducial and other less common, or non-probabilistic approaches. The GUM Committee is presently working on changing the GUM basic principles to a full Bayesian approach. Particular attention will be given to these issues. A neo-classical alternative will be presented, and the different methods will be illustrated by examples.

The workshop will be divided into three parts. Part 1 will cover introduction to the subject matterss - Robin Willink will talk about GUM, and Franco Pavese about ISO 5725 (parts 1 and 2). Part 2 will cover case studies presented by attendees. Part 3 will be dedicated to discussion.

For additional information and registration, click here.

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