TS ISO 5725-5

TS ISO 5725-5 addresses alternative approaches for determining the precision of a standard measurement method within the broader subject of accuracy of measurement methods and results. This part focuses on analysing precision-experiment results with robust methods, rather than relying on outlier tests to remove data from the calculation. In practical terms, it supports a more stable evaluation of precision components by reducing the need to decide whether individual unusual observations should be excluded.

What robust analysis means in this context

In general technical terms, precision describes how close repeated measurements are to one another under stated conditions, and it is a central indicator of method performance. In conventional statistical treatment, outlying values can strongly influence dispersion measures and therefore the estimated precision. The alternative methods covered by this part are intended to make the analysis more resilient to such influences, so the assessment is less dependent on ad hoc exclusion decisions.

Where it is useful and what it does not claim

This type of analysis is relevant in laboratories, method-development studies, and measurement-system evaluations where experimental data naturally show variability. The key distinction is that this standard part concerns the framework for evaluating precision of a measurement method; it should not be read as defining a special test for a particular instrument, product category, or single experimental arrangement. Its value lies in supporting precision analysis without making the results overly sensitive to data-rejection decisions.