ENBIS-18 in Nancy

2 – 25 September 2018; Ecoles des Mines, Nancy (France) Abstract submission: 20 December 2017 – 4 June 2018

How to Select the Uncertainty of Reproducibility from Inter-Laboratory Tests for the Uncertainty Declaration of Building Acoustic Measurements

4 September 2018, 14:30 – 14:50

Abstract

Submitted by
Antonio Pievatolo
Authors
Chiara Scrosati (CNR-ITC), Antonio Pievatolo (CNR-IMATI), Massimo Garai (Department of Industrial Engineering, University of Bologna)
Abstract
This work addresses the standard deviation of reproducibility obtained from multiple Inter-Laboratory Tests (ILTs), which has been standardized in ISO 12999-1. This standard deviation is intended to be used for the declaration of uncertainty in test reports of building acoustics measurements. Therefore it is necessary that the declared uncertainty be representative of all the specimens, or products, that could be tested. This work demonstrates that the new criterion for specifying the standard deviation, introduced for the first time in ISO 12999-1, leads to overcoverage. Moreover, two other methods are presented, the former based on a Bayesian analysis and the latter on random variance and fixed mean, to demonstrate that the reproducibility standard deviation, computed as the square root of the mean value of the variances of all the ILTs included in ISO 12999-1, is the natural choice for the declaration of uncertainty.
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