prEN ISO 4259-1

Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test (ISO/DIS 4259‑1:2025)

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.

Mineralöl und verwandte Produkte - Präzision von Messverfahren und Ergebnissen - Teil 1: Bestimmung der Präzisionsdaten von Prüfverfahren (ISO/DIS 4259‑1:2025)

Produits pétroliers et connexes - Fidélité des méthodes de mesure et de leurs résultats - Partie 1: Détermination des valeurs de fidélité relatives aux méthodes d'essai (ISO/DIS 4259-1:2025)

ISO 4259-1:2017 spécifié la méthodologie pour la conception d'un essai interlaboratoires (ILS) et pour le calcul des estimations de fidélité d'une méthode d'essai spécifié par cet ILS. En particulier, il définit les termes statistiques concernés (Article 3), les procédures à suivre dans l'organisation d'un ILS destiné à déterminer la fidélité d'une méthode d'essai (Article 4) et la méthode de calcul de la fidélité à partir des résultats d'un tel ILS (Articles 5 et 6).
Les procédures de l' ISO 4259-1:2017 ont été conçues spécifiquement pour les produits pétroliers et leurs produits connexes qui sont normalement considérés homogènes. Les procédures décrites dans le présent document peuvent cependant aussi s'appliquer à d'autres types de produits homogènes. Il est nécessaire de procéder à des contrôles attentifs avant d'appliquer ce document à des produits pour lesquels la présomption d'homogénéité peut être mise en question.

Nafta in sorodni proizvodi - Natančnost merilnih metod in rezultatov - 1. del: Določevanje natančnosti preskusnih metod (ISO/DIS 4259-1:2025)

General Information

• Status: Not Published
• Publication Date: 02-Nov-2026
• ICS: 75.080 - Petroleum products in general
• Technical Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 10-Apr-2025
• Completion Date: 10-Apr-2025
• Ref Project: oSIST prEN ISO 4259-1:2025 - Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test (ISO/DIS 4259-1:2025)

Relations

• Revises: EN ISO 4259-1:2017/A2:2020 - Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test - Amendment 2 (ISO 4259-1:2017/Amd 2:2020)
• Effective Date: 21-Feb-2024
• Revises: EN ISO 4259-1:2017/A1:2019 - Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test - Amendment 1 (ISO 4259-1:2017/Amd 1:2019)
• Effective Date: 21-Feb-2024
• Revises: EN ISO 4259-1:2017 - Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test (ISO 4259-1:2017)
• Effective Date: 21-Feb-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2025
Nafta in sorodni proizvodi - Natančnost merilnih metod in rezultatov - 1. del:
Določevanje natančnosti preskusnih metod (ISO/DIS 4259-1:2025)
Petroleum and related products - Precision of measurement methods and results - Part
1: Determination of precision data in relation to methods of test (ISO/DIS 4259-1:2025)
Mineralöl und verwandte Produkte - Präzision von Messverfahren und Ergebnissen - Teil
1: Bestimmung der Präzisionsdaten von Prüfverfahren (ISO/DIS 4259-1:2025)
Produits pétroliers et connexes - Fidélité des méthodes de mesure et de leurs résultats -
Partie 1: Détermination des valeurs de fidélité relatives aux méthodes d'essai (ISO/DIS
4259-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 4259-1
ICS:
75.080 Naftni proizvodi na splošno Petroleum products in
general
75.180.30 Oprema za merjenje Volumetric equipment and
prostornine in merjenje measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 4259-1
ISO/TC 28
Petroleum and related products —
Secretariat: NEN
Precision of measurement methods
Voting begins on:
and results —
2025-04-08
Part 1:
Voting terminates on:
2025-07-01
Determination of precision data in
relation to methods of test
Produits pétroliers et connexes — Fidélité des méthodes de
mesure et de leurs résultats —
Partie 1: Détermination des valeurs de fidélité relatives aux
méthodes d'essai
ICS: 75.080
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Reference number
ISO/DIS 4259-1:2025(en)
DRAFT
ISO/DIS 4259-1:2025(en)
International
Standard
ISO/DIS 4259-1
ISO/TC 28
Petroleum and related products —
Secretariat: NEN
Precision of measurement methods
Voting begins on:
and results —
Part 1:
Voting terminates on:
Determination of precision data in
relation to methods of test
Produits pétroliers et connexes — Fidélité des méthodes de
mesure et de leurs résultats —
Partie 1: Détermination des valeurs de fidélité relatives aux
méthodes d'essai
ICS: 75.080
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
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Published in Switzerland Reference number
ISO/DIS 4259-1:2025(en)
ii
ISO/DIS 4259-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Stages in the planning of an interlaboratory study for the determination of the precision
of a test method . 4
4.1 General .4
4.2 Preparing a draft method of test .5
4.3 Planning a pilot study with at least two laboratories .5
4.4 Planning the ILS . .5
4.5 Executing the ILS .6
5 Statistical treatment of ILS results. 7
5.1 General recommendation .7
5.2 Pre-screen using GESD technique .7
5.3 Transformation of data and outlier tests .8
5.3.1 General .8
5.3.2 Outlier identification after pre-screening .11
5.3.3 Uniformity of repeatability .11
5.3.4 Uniformity of reproducibility .11
5.4 Rejection of complete data (from all laboratories) for a sample .11
5.5 Estimating missing or rejected values . 12
5.5.1 One of the two repeat values missing or rejected. 12
5.5.2 Both repeat values missing or rejected. 12
5.6 Rejection test for outlying laboratories . 12
5.7 Confirmation of selected transformation . 13
5.7.1 General . 13
5.7.2 Identification of excessively influential sample(s) . 13
6 Analysis of variance, calculation and expression of precision estimates . 14
6.1 General .14
6.2 Analysis of variance .14
6.2.1 Forming the sums of squares for the laboratories × samples interaction sum of
squares .14
6.2.2 Forming the sum of squares for the exact analysis of variance . 15
6.2.3 Degrees of freedom . 15
6.2.4 Mean squares and analysis of variance. 15
6.3 Expectation of mean squares and calculation of precision estimates . 15
6.3.1 Expectation of mean squares with no estimated values . 15
6.3.2 Expectation of mean squares with estimated values .16
6.3.3 Calculation of precision estimates .17
6.4 Expression of precision estimates of a method of test .18
6.5 Specification of scope for the test method .19
6.6 Reporting limits instruction for the test method .19
7 R/r ratio .20
Annex A (normative) Determination of number of samples required .21
Annex B (informative) Derivation of formula for estimating the number of laboratories and
samples required to meet minimum 30 degrees of freedom .23
Annex C (normative) Notation and tests .25
Annex D (normative) Illustration of procedures using ILS results for Bromine Number and
statistical tables .30

iii
ISO/DIS 4259-1:2025(en)
Annex E (normative) Types of dependence and corresponding transformations .49
Annex F (normative) Weighted linear regression analysis .55
Annex G (normative) Rules for rounding .62
Annex H (normative) GESD technique to simultaneously identify multiple outliers in a data set .63
Annex I (informative) Glossary .71
Bibliography . 74

iv
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