TS ISO 13528

TS ISO 13528 addresses the statistical methods used to evaluate results from proficiency testing based on interlaboratory comparisons. It explains established statistical approaches that support not only the collection of results, but also their meaningful summarisation, the comparison of participant performance, and the consistent interpretation of scheme outcomes.

What statistical evaluation in proficiency testing covers

In proficiency testing schemes, the aim is to compare the data produced by different laboratories on the same or similar items. In that setting, core statistical ideas such as averages, dispersion, deviations, and the influence of outliers become central. TS ISO 13528 identifies sound statistical methods that can be used to analyse these data and provides guidance on how the results may be applied in practice.

From a metrology and quality-assurance perspective, this topic matters because interlaboratory comparisons reveal not only the performance of one laboratory, but also the consistency of a wider measurement process. Since organisers, participants, and accreditation bodies may all look at the same dataset from different roles, a common statistical language is valuable for consistent decision-making.

• Statistical analysis methods for data from interlaboratory comparisons
• Practical guidance for interpreting proficiency testing outcomes
• Usage recommendations for participants and accreditation bodies
• A complementary framework to ISO Guide 43 (all parts)

This record corresponds to the 2015 edition of TS ISO 13528 and is listed as withdrawn in the publication metadata. Even so, its subject remains relevant as a technical reference for understanding statistical evaluation in proficiency testing and the logic of interlaboratory comparison.