NEN EN ISO 4259 : 2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Stages in the planning of an inter-laboratory test
   programme for the determination of the precision of
   a test method
   4.1 General
   4.2 Preparing a draft method of test
   4.3 Planning a pilot programme with at least two
       laboratories
   4.4 Planning the inter-laboratory programme
   4.5 Executing the inter-laboratory programme
5 Inspection of inter-laboratory results for uniformity
   and for outliers
   5.1 General
   5.2 Transformation of data
   5.3 Tests for outliers
   5.4 Rejection of complete data from a sample
   5.5 Estimating missing or rejected values
   5.6 Rejection test for outlying laboratories
   5.7 Confirmation of selected transformation
6 Analysis of variance, calculation and expression of
   precision estimates
   6.1 General
   6.2 Analysis of variance
   6.3 Expectation of mean squares and calculation of
       precision estimates
   6.4 Expression of precision estimates of a method of test
7 Significance of repeatability (r) and reproducibility (R)
   7.1 General
   7.2 Repeatability, r
   7.3 Reproducibility, R
8 Specifications
   8.1 Aim of specifications
   8.2 Construction of specifications limits in relation
       to precision
9 Quality control against specifications
   9.1 General
   9.2 Testing margin at the supplier
   9.3 Testing margin at the recipient
10 Dispute procedure
Annex A (normative) Determination of number of samples
                      required
Annex B (informative) Derivation of equation for calculating
                      the number of samples required
Annex C (normative) Notation and tests
Annex D (normative) Example results of test for determination
                      of bromine number and statistical tables
Annex E (normative) Types of dependence and corresponding
                      transformations
Annex F (normative) Weighted linear regression analysis
Annex G (normative) Rules for rounding off results
Annex H (informative) Explanation of equations given in Clause 7
Annex I (informative) Specifications that relate to a specified
                      degree of criticality
Bibliography

Describes calculation of precision estimates and application to specifications, also contains definitions of relevant statistical terms, procedures for adoption in planning of an inter-laboratory test programme for determination of precision of a test method, calculation method for precision for results of programme and procedure for interpreting laboratory results relating to precision of methods and to limits laid down by specifications.