Table of Contents

Foreword<br>Introduction<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Stages in the planning of an interlaboratory study<br>&nbsp;&nbsp;for the determination of the precision of a test method<br>5 Statistical treatment of ILS results<br>6 Analysis of variance, calculation and expression of<br>&nbsp;&nbsp;precision estimates<br>7 R/r ratio<br>Annex A (normative) - Determination of number of samples<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;required<br>Annex B (informative) - Derivation of formula for estimating<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;the number of laboratories and samples required to<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;meet minimum 30 degrees of freedom<br>Annex C (normative) - Notation and tests<br>Annex D (normative) - Illustration of procedures using ILS<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;results for Bromine Number and statistical tables<br>Annex E (normative) - Types of dependence and<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;corresponding transformations<br>Annex F (normative) - Weighted linear regression analysis<br>Annex G (normative) - Rules for rounding<br>Annex H (normative) - GESD technique to simultaneously<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;identify multiple outliers in a data set<br>Annex I (informative) - Glossary<br>Bibliography

Abstract

This document specifies the methodology for the design of an Interlaboratory Study (ILS) and calculation of precision estimates of a test method specified by the study. In particular, it defines the relevant statistical terms (Clause 3), the procedures to be adopted in the planning of ILS to determine the precision of a test method (Clause 4), and the method of calculating the precision from the results of such a study (Clauses 5 and 6).

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Organization for Standardization
Pages
ISBN
Committee	TC 28
Supersedes	ISO 4259 : 2006