ISO/TC 69/SC 6
| Project No. | ISO 5725-2:2019 |
|---|---|
| Title | <p><b>1.1</b> This document</p> <p>— 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>— provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods;</p> <p>— provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.</p> <p>NOTE Modifications to this basic method for particular purposes are given in other parts of ISO 5725.</p> <p><b>1.2 </b>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><b>1.3 </b>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><b>1.4 </b>The statistical model of ISO 5725-1:1994, 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><b>1.5 </b>The basic method, as described in this document, (usually) estimates the precision of a measurement method:</p> <p>a) when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;</p> <p>b) when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values; and</p> <p>c) when the use of a balanced uniform-level layout is acceptable.</p> <p><b>1.6 </b>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) | 69419 |
| Scope | <p><b>1.1</b> This document</p> <p>— 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>— provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods;</p> <p>— provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.</p> <p>NOTE Modifications to this basic method for particular purposes are given in other parts of ISO 5725.</p> <p><b>1.2 </b>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><b>1.3 </b>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><b>1.4 </b>The statistical model of ISO 5725-1:1994, 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><b>1.5 </b>The basic method, as described in this document, (usually) estimates the precision of a measurement method:</p> <p>a) when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;</p> <p>b) when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values; and</p> <p>c) when the use of a balanced uniform-level layout is acceptable.</p> <p><b>1.6 </b>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 |