EN ISO 4259-1:2017

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Stages in the planning of an interlaboratory
  study for the determination of the
  precision of a test method
5 Statistical treatment of ILS results
6 Analysis of variance, calculation and expression
  of precision estimates
7 R/r ratio
Annex A (normative) - Determination of number
        of samples required
Annex B (informative) - Derivation of formula for
        estimating the number of laboratories and
        samples required to meet minimum 30
        degrees of freedom
Annex C (normative) - Notation and tests
Annex D (normative) - Illustration of procedures
        using ILS results for 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
Annex H (normative) - GESD technique to
        simultaneously identify multiple outliers
        in a data set
Annex I (informative) - Glossary
Bibliography

ISO 4259-1:2017 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).The procedures in ISO 4259-1:2017 have been designed specifically for petroleum and petroleum related products, which are normally considered as homogeneous. However, the procedures described in ISO 4259-1:2017 can also be applied to other types of homogeneous products. Careful investigations are necessary before applying ISO 4259-1:2017 to products for which the assumption of homogeneity can be questioned.