ISO/TC 69/SC 6
| Project No. | ISO 5725-2:2025 |
|---|---|
| Title | <p class="MsoNormal">1.1<span style="mso-tab-count: 1;"> </span>This document</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>amplifies the general principles for designing experiments for the numerical estimation of the precision of measurement methods by means of a collaborative interlaboratory experiment,</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods, and</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.</p> <p class="MsoNormal">NOTE<span style="mso-tab-count: 1;"> </span>Modifications to this basic method for particular purposes are given in other parts of ISO 5725.</p> <p class="MsoNormal">1.2<span style="mso-tab-count: 1;"> </span>It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the test result, although this single value can be the outcome of a calculation from a set of observations.</p> <p class="MsoNormal">1.3<span style="mso-tab-count: 1;"> </span>It assumes that in the design and performance of the precision experiment, all the principles as laid down in ISO 5725-1 are observed. The basic method uses the same number of test results in each laboratory, with each laboratory analysing the same levels of test sample; i.e. a balanced uniform-level experiment. The basic method applies to procedures that have been standardized and are in regular use in a number of laboratories.</p> <p class="MsoNormal">1.4<span style="mso-tab-count: 1;"> </span>The statistical model of ISO 5725-1:2023, Clause 5, is accepted as a suitable basis for the interpretation and analysis of the test results, the distribution of which is approximately normal.</p> <p class="MsoNormal">1.5<span style="mso-tab-count: 1;"> </span>The basic method, as described in this document, (usually) estimates the precision of a measurement method:</p> <p class="MsoNormal">a)<span style="mso-tab-count: 1;"> </span>when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;</p> <p class="MsoNormal">b)<span style="mso-tab-count: 1;"> </span>when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values;</p> <p class="MsoNormal">c)<span style="mso-tab-count: 1;"> </span>when the use of a balanced uniform-level layout is acceptable.</p> <p class="MsoNormal">1.6<span style="mso-tab-count: 1;"> </span>The same approach can be used to make a preliminary estimate of precision for measurement methods which have not reached standardization or are not in routine use.</p> |
| Registration number (WIID) | 90054 |
| Scope | <p class="MsoNormal">1.1<span style="mso-tab-count: 1;"> </span>This document</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>amplifies the general principles for designing experiments for the numerical estimation of the precision of measurement methods by means of a collaborative interlaboratory experiment,</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods, and</p> <p class="MsoNormal">—<span style="mso-tab-count: 1;"> </span>provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.</p> <p class="MsoNormal">NOTE<span style="mso-tab-count: 1;"> </span>Modifications to this basic method for particular purposes are given in other parts of ISO 5725.</p> <p class="MsoNormal">1.2<span style="mso-tab-count: 1;"> </span>It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the test result, although this single value can be the outcome of a calculation from a set of observations.</p> <p class="MsoNormal">1.3<span style="mso-tab-count: 1;"> </span>It assumes that in the design and performance of the precision experiment, all the principles as laid down in ISO 5725-1 are observed. The basic method uses the same number of test results in each laboratory, with each laboratory analysing the same levels of test sample; i.e. a balanced uniform-level experiment. The basic method applies to procedures that have been standardized and are in regular use in a number of laboratories.</p> <p class="MsoNormal">1.4<span style="mso-tab-count: 1;"> </span>The statistical model of ISO 5725-1:2023, Clause 5, is accepted as a suitable basis for the interpretation and analysis of the test results, the distribution of which is approximately normal.</p> <p class="MsoNormal">1.5<span style="mso-tab-count: 1;"> </span>The basic method, as described in this document, (usually) estimates the precision of a measurement method:</p> <p class="MsoNormal">a)<span style="mso-tab-count: 1;"> </span>when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;</p> <p class="MsoNormal">b)<span style="mso-tab-count: 1;"> </span>when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values;</p> <p class="MsoNormal">c)<span style="mso-tab-count: 1;"> </span>when the use of a balanced uniform-level layout is acceptable.</p> <p class="MsoNormal">1.6<span style="mso-tab-count: 1;"> </span>The same approach can be used to make a preliminary estimate of precision for measurement methods which have not reached standardization or are not in routine use.</p> |
| Status | Standarts spēkā |
| ICS group | 03.120.30 17.020 |