This guide is for conducting Interlaboratory studies of acoustics test methods is situations where there are less than six laboratories available to conduct testing according to the test method. While other standards exist which address this issue in other areas of testing, acoustics testing usually involves a result set over a range of frequencies and a complex classification based on the results over the frequency range.
Precision and Bias; Acoustics
Many of the test methods in E33 are only performed by a handful of laboratories. Those performing interlaboratory studies to determine precision and bias often need to contend with small numbers of participating laboratories. In addition, the techniques presented in E691 and other related standards assume that each result is completely independent of other results for the same material and that is not strictly true when dealing with results over a range of frequencies. And some of the classification methods used in E33 standards provide a numerical classification that is obtained by a complex curve fitting process. Applying the standard statistical techniques to these classifications, which is often done, may result in misleading precision estimates.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: E33.05
Staff Manager: Kelly Paul
Date Initiated: 04-19-2022
Technical Contact: Robert Hallman