Since the publication of the newly revised ISO/IEC 17025:2017, measurement uncertainty evaluation has expanded its coverage to include sampling uncertainty as well because ISO has recognized that sampling uncertainty can be a serious factor in the final test result obtained from a given sample ……
The concept of measurement uncertainty – a new pespective
Nearly all analysis requires the taking of a sample, a procedure which itself introduces uncertainty into the final test result. Hence a measurement uncertainty should cover both the uncertainties of sampling and analysis….
A worked example to estimate sampling precision and MU
To understand how to go about evaluating sampling uncertainty and quality control of sampling, we must be familiar with the basic analysis of variance ANOVA principles….
An illustration of One-way ANOVA