1.1<\/b><\/p>\n
This document<\/p>\n
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>\n<\/li>\n
provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods;<\/p>\n<\/li>\n
provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.<\/p>\n<\/li>\n<\/ul>\n
\nNOTE Modifications to this basic method for particular purposes are given in other parts of ISO 5725.<\/p>\n<\/blockquote>\n
1.2<\/b><\/p>\n
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>\n
1.3<\/b><\/p>\n
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>\n
1.4<\/b><\/p>\n
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>\n
1.5<\/b><\/p>\n
The basic method, as described in this document, (usually) estimates the precision of a measurement method:<\/p>\n
\n
- \n
when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;<\/p>\n<\/li>\n
- \n
when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values; and<\/p>\n<\/li>\n
- \n
when the use of a balanced uniform-level layout is acceptable.<\/p>\n<\/li>\n<\/ol>\n
1.6<\/b><\/p>\n
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>\n
PDF Catalog<\/h4>\n
\n
\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 2<\/td>\n undefined <\/td>\n<\/tr>\n \n 7<\/td>\n Foreword <\/td>\n<\/tr>\n \n 8<\/td>\n Introduction <\/td>\n<\/tr>\n \n 9<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 10<\/td>\n 2 Normative references
3 Terms and definitions
4 Symbols <\/td>\n<\/tr>\n\n 12<\/td>\n 5 Estimates of the parameters in the basic model <\/td>\n<\/tr>\n \n 13<\/td>\n 6 Requirements for a precision experiment
6.1 Layout of the experiment <\/td>\n<\/tr>\n\n 14<\/td>\n 6.2 Recruitment of the laboratories
6.3 Preparation of the materials <\/td>\n<\/tr>\n\n 15<\/td>\n 7 Personnel involved in a precision experiment
7.1 Panel <\/td>\n<\/tr>\n\n 16<\/td>\n 7.2 Statistical functions
7.3 Executive functions <\/td>\n<\/tr>\n\n 17<\/td>\n 7.4 Supervisors <\/td>\n<\/tr>\n \n 18<\/td>\n 7.5 Operators
8 Statistical analysis of a precision experiment
8.1 Preliminary considerations <\/td>\n<\/tr>\n\n 19<\/td>\n 8.2 Tabulation of the results and notation used
8.2.1 Cells
8.2.2 Redundant data
8.2.3 Missing data
8.2.4 Outliers
8.2.5 Outlying laboratories
8.2.6 Erroneous data
8.2.7 Balanced uniform-level test results <\/td>\n<\/tr>\n\n 20<\/td>\n 8.2.8 Collation of data and intermediate values
8.2.9 Original test results
8.2.10 Cell means (Form B of Figure 2)
8.2.11 Measures of cell spread (Form C of Figure 2) <\/td>\n<\/tr>\n\n 21<\/td>\n 8.2.12 Corrected or rejected data
8.3 Scrutiny of results for consistency and outliers
8.3.1 Approaches for scrutiny of data
8.3.2 Graphical consistency technique <\/td>\n<\/tr>\n\n 24<\/td>\n 8.3.3 Numerical outlier technique
8.3.4 Cochran\u2019s test <\/td>\n<\/tr>\n\n 26<\/td>\n 8.3.5 Grubbs\u2019 tests <\/td>\n<\/tr>\n \n 28<\/td>\n 8.3.6 Repeated testing for outlying means or outlying data points
8.3.7 Alternative outlier inspection and test methods
8.4 Calculation of the general mean and variances
8.4.1 Method of analysis <\/td>\n<\/tr>\n\n 29<\/td>\n 8.4.2 Basic data
8.4.3 Non-empty cells
8.4.4 Calculation of the general mean, \ufffc
8.4.5 Calculation of variances <\/td>\n<\/tr>\n\n 30<\/td>\n 8.4.6 Alternative calculation methods for variances <\/td>\n<\/tr>\n \n 31<\/td>\n 8.4.7 Dependence of the variances upon m
8.5 Establishing a functional relationship between precision values, s, and the mean level, m
8.5.1 Choice of functional relationship <\/td>\n<\/tr>\n\n 32<\/td>\n 8.5.2 Fitting relationships I and II <\/td>\n<\/tr>\n \n 33<\/td>\n 8.5.3 Fitting relationship III <\/td>\n<\/tr>\n \n 34<\/td>\n 8.5.4 Fitting relationship IV <\/td>\n<\/tr>\n \n 36<\/td>\n 8.6 Statistical analysis as a step-by-step procedure <\/td>\n<\/tr>\n \n 38<\/td>\n 8.7 Report to the panel and decisions to be taken by the panel
8.7.1 Report by the statistical expert <\/td>\n<\/tr>\n\n 40<\/td>\n 8.7.2 Decisions to be taken by the panel <\/td>\n<\/tr>\n \n 41<\/td>\n 8.7.3 Full report
9 Statistical tables <\/td>\n<\/tr>\n\n 46<\/td>\n Annex A (informative) Number of laboratories required for an estimate of precision <\/td>\n<\/tr>\n \n 49<\/td>\n Annex B (informative) Alternative calculations of variance components <\/td>\n<\/tr>\n \n 52<\/td>\n Annex C (informative) Examples of the statistical analysis of precision experiments <\/td>\n<\/tr>\n \n 74<\/td>\n Annex D (informative) Calculation of critical values and indicators <\/td>\n<\/tr>\n \n 77<\/td>\n Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Accuracy (trueness and precision) of measurement methods and results – Basic method for the determination of repeatability and reproducibility of a standard measurement method<\/b><\/p>\n
\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2019<\/td>\n 78<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":420954,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[97,2641],"product_tag":[],"class_list":{"0":"post-420945","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-03-120-30","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/420945","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/420954"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=420945"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=420945"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=420945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}