ISO 4259-1:2017

© ISO 2017 – All rights reserved
Style Definition
ISO/TC 28
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Formatted: English (U.S.)
Date: 2017‐10‐02
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ISO 4259-1:2017(E)
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ISO/TC 28/WG 2
Formatted: Font: 12 pt, Bold, English
Secretariat: NEN (U.S.)
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Petroleum and related products — Precision of measurement methods and results —
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Part 1: Determination of precision data in relation to methods of test
Formatted: Font: 12 pt, Bold,
German (Switzerland)
Produits pétroliers -- Fidélité des méthodes de mesure et des résultats -- Partie 1: Détermination
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des valeurs de fidélité relatives aux méthodes d'essai
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Document type: International Standard
Document subtype:
Document stage: (50) Approval
Document language: E

STD Version 2.3

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Deleted: Copyright notice¶
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© ISO 2017 – All rights reserved
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Deleted: 1 Scope 1¶
2 Normative references 1¶
3 Terms and definitions 1¶
Stages in the planning of an
4
Contents Page
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 4¶
4.3 Planning a pilot study with
at least two laboratories 4¶
4.4 Planning the ILS 5¶
4.5 Executing the ILS 5¶
5 Statistical treatment of ILS
results 6¶
5.1 General recommendation 6¶
5.2 Pre-screen using GESD
technique 7¶
5.3 Transformation of data and
outlier tests 8¶
5.4 Rejection of complete data
(from all laboratories) for a
sample 10¶
5.5 Estimating missing or
rejected values 10¶
5.6 Rejection test for outlying
laboratories 11¶
Confirmation of selected
5.7
transformation 11¶
6 Analysis of variance,
calculation and expression of
precision estimates 12¶
6.1 General 12¶
6.2 Analysis of variance 12¶
6.3 Expectation of mean squares
and calculation of precision
estimates 14¶
6.4 Expression of precision
estimates of a method of test 16¶
6.5 Specification of scope for the
test method 17¶
7 R / r ratio 18¶
Annex A (normative)
Determination of number of
samples required 19¶
Annex B (informative) Derivation
of formula for estimating the
number of labs and samples
required to meet minimum 30
degrees of freedom (Table
A.1) 21¶
B.1 Degrees of freedom 21¶
B.2 Explanation for choice of 30
as Minimum degrees of
freedom 22¶
Annex C (normative) Notation and
tests 23¶
C.1 Introduction 23¶
C.2 Array of duplicate
results 23¶
C.3 Array of sums of duplicate
results 24¶
C.4 Sums of squares and
variances 24¶
C.5 Cochran's test 25¶
C.6 Hawkins' test 25¶
C.7 Variance ratio test (F-
test) 27¶
Annex D (normative) Illustration
of procedures using ILS results
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© ISO 2017 – All rights reserved
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Foreword
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patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent right
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NORME ISO
INTERNATIONALE 4259-1
Première édition
2017-11
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
Petroleum and related products — Precision of measurement
methods and results —
Part 1: Determination of precision data in relation to methods of test
Numéro de référence
ISO 4259-1:2017(F)
©
ISO 2017

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ISO 4259-1:2017(F)

DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2017, Publié en Suisse
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ii © ISO 2017 – Tous droits réservés

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ISO 4259-1:2017(F)

Sommaire Page
Avant-propos .v
Introduction .vi
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Étapes de l'organisation d'un essai interlaboratoires pour la détermination de la
fidélité d'une méthode d'essai . 4
4.1 Généralités . 4
4.2 Préparation d'un projet de méthode d'essai . 5
4.3 Organisation d'un ILS pilote avec au moins deux laboratoires . 5
4.4 Organisation de l’ILS . 5
4.5 Exécution de l’ILS . 6
5 Traitement statistique des résultats de l’ILS. 7
5.1 Recommandation . 7
5.2 Prévisualisation selon la technique GESD . 8
5.3 Transformation des données et recherche des valeurs aberrantes . 9
5.3.1 Généralités . 9
5.3.2 Identification des valeurs aberrantes après prévisualisation .11
5.3.3 Uniformité de la répétabilité .11
5.3.4 Uniformité de la reproductibilité .11
5.4 Rejet de tous les résultats (de tous les laboratoires) concernant un échanti
...