What is ISO 5725‑2 - Accuracy of measurement methods and results about?
ISO 5725‑2 is the second part of the multi-series standard that focuses on the accuracy of measurement methods and results and the basic method for the determination of repeatability and reproducibility of a standard measurement method. ISO 5725‑2 amplifies the general principles for designing experiments for the numerical estimation of the.
ISO 5725‑2 provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods
Note-
Modifications to this basic method for particular purposes are given in other parts of ISO 5725‑2
Who is ISO 5725‑2 - Accuracy of measurement methods and results for?
ISO 5725‑2 accuracy of measurement methods and the result is useful for:
- Quality assurance team
- Test laboratories
- Operators of test equipment
Why should you use ISO 5725‑2 - Accuracy of measurement methods and results?
ISO 5725‑2 is concerned solely with estimating the repeatability standard deviation and reproducibility standard deviation based on an interlaboratory design in which each laboratory
conducts several independent measurements of the same sample under repeatability conditions.
ISO 5725‑2 provides you with practical examples of estimating the precision of measurement methods by experiment. Worked examples are given to demonstrate balanced uniform sets of test results, although in one example a variable number of replicates per cell were reported (unbalanced design) and in another, some data were missing. This is because an experiment designed to be balanced can turn out to be unbalanced. Stragglers and outliers are also considered.
What’s changed since the last update?
BS ISO 5725‑2:2019 supersedes BS ISO 5725‑2:1994. BS ISO 5725‑2:2019 includes some technical changes. These include:
- Permission is given to use alternative scrutiny and outlier detection tests provided that the performance is similar
- Permission is given to apply modern statistical methods available for calculations of the relevant precision and trueness characteristics
- Guidance on the number of laboratories required for a precision study has been included
- Information on the computation of critical values has been included
