TS ISO 5725-3
Accuracy (trueness and precision) of measurement methods and results - Part 3: Intermediate precision and alternative designs for collaborative studies
This document provides
a) a discussion of alternative experimental designs for the determination of trueness and precision measures including reproducibility, repeatability and selected measures of intermediate precision of a standard measurement method, including a review of the circumstances in which their use is necessary or beneficial, and guidance as to the interpretation and application of the resulting estimates, and
b) worked examples including specific designs and computations.
Each of the alternative designs discussed in this document is intended to address one (or several) of the following issues:
a) a discussion of the implications of the definitions of intermediate precision measures;
b) a guidance on the interpretation and application of the estimates of intermediate precision measures in practical situations;
c) determining reproducibility, repeatability and selected measures of intermediate precision;
d) improved determination of reproducibility and other measures of precision;
e) improving the estimate of the sample mean;
f) determining the range of in-house repeatability standard deviations;
g) determining other precision components such as operator variability;
h) determining the level of reliability of precision estimates;
i) reducing the minimum number of participating laboratories by optimizing the reliability of precision estimates;
j) avoiding distorted estimations of repeatability (split-level designs);
k) avoiding distorted estimations of reproducibility (taking the heterogeneity of the material into consideration).
Often, the performance of the method whose precision is being evaluated in a collaborative study will have previously been assessed in a single-laboratory validation study conducted by the laboratory which developed it. Relevant factors for the determination of intermediary precision will have been identified in this prior single-laboratory study.
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About This Item
TS ISO 5725-3 is the part of the ISO 5725 series that addresses intermediate precision and alternative experimental designs for collaborative studies when evaluating the trueness and precision of measurement methods and results. It focuses on how multi-laboratory studies can be structured and interpreted so that the precision performance of a standard measurement method is assessed in a technically meaningful way.
Intermediate precision in the measurement system
In general technical terms, repeatability describes the spread of results obtained under closely similar conditions, while reproducibility reflects variation between laboratories. Intermediate precision sits between these extremes and captures variation within one laboratory when conditions such as time, operator, or equipment change. This part explains how such components can be studied in collaborative work and why alternative designs may be useful when the goal is to estimate precision more reliably.
What this part discusses
- Alternative experimental designs for assessing trueness and precision measures in standard measurement methods.
- Guidance for determining reproducibility, repeatability, and selected measures of intermediate precision.
- Interpretation of the resulting estimates and their use in practical measurement situations.
- Worked examples that include specific designs and calculations.
- General approaches to operator variability, sample mean estimation, and improving the reliability of precision estimates with fewer participating laboratories.
In practice, these collaborative studies often follow a single-laboratory validation carried out by the method developer, where important sources of variation for intermediate precision are first identified. Material heterogeneity, split-level arrangements, and other design effects can distort precision estimates if they are not considered carefully. The value of this standard lies in linking study design with statistical interpretation, so that precision components are estimated and used in a controlled, technically consistent way.
- Publication Date: 5.07.2023
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 17.020 Metroloji ve Ölçme (Genel) *Kimyasal referan; 03.120.30 İstatistiksel Metotların Uygulanması
- Pages: 69
- Source Standard: ISO 5725-3:2023
- International Equivalents: ISO 5725-3-EQV
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