ISO 10928:2024

FINAL DRAFT
International
Standard
ISO/FDIS 10928
ISO/TC 138/SC 6
Plastics piping systems — Glass-
Secretariat: ASI
reinforced thermosetting plastics
Voting begins on:
(GRP) pipes and fittings — Methods
2023-12-26
for regression analysis and their use
Voting terminates on:
2024-02-20
Systèmes de canalisations en matières plastiques — Tubes et
raccords plastiques thermodurcissables renforcés de verre (PRV)
— Méthodes pour une analyse de régression et leurs utilisations
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 10928:2023(en) © ISO 2023

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FINAL DRAFT
ISO/FDIS 10928:2023(en)
International
Standard
ISO/FDIS 10928
ISO/TC 138/SC 6
Plastics piping systems — Glass-
Secretariat: ASI
reinforced thermosetting plastics
Voting begins on:
(GRP) pipes and fittings — Methods
for regression analysis and their use
Voting terminates on:
Systèmes de canalisations en matières plastiques — Tubes et
raccords plastiques thermodurcissables renforcés de verre (PRV)
— Méthodes pour une analyse de régression et leurs utilisations
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
COPYRIGHT PROTECTED DOCUMENT
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2023
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 10928:2023(en) © ISO 2023

© ISO 2023 – All rights reserved
ii

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ISO/FDIS 10928:2023(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Procedures for determining the linear relationships — Methods A and B . 2
5.1 Procedures common to methods A and B .2
5.2 Method A — Covariance method.2
5.2.1 General .
...

2023-10-25
ISO/FDIS 10928:2023(E)
ISO /TC 138/SC 06/WG 01 6
Secretariat: ASI
Date: 2023-12-11
Plastics piping systems — Glass-reinforced thermosetting plastics
(GRP) pipes and fittings — Methods for regression analysis and
their use
Systèmes de canalisationcanalisations en matières plastiques — Tubes et raccords plastiques
thermodurcissables renforcés de verre (PRV) — Méthodes pour une analyse de régression et leurs
utilisations
FDIS stage

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ISO/FDIS 10928:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

ii

---------------------- Page: 2 ----------------------
ISO/FDIS 10928:2023(E)
Contents
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Procedures for determining the linear relationships — Methods A and B . 1
5.1 Procedures common to methods A and B . 1
5.2 Method A — Covariance method . 2
5.2.1 General . 2
5.2.2 Suitability of data . 3
5.2.3 Functional relationships . 4
5.2.4 Calculation of variances . 4
5.2.5 Check for the suitability of data for extrapolation . 5
5.2.6 Validation of statistical procedures by an example calculation . 6
5.3 Method B — Regression with time as the independent variable . 10
5.3.1 General . 10
5.3.2 Suitability of data . 11
5.3.3 Functional relationships . 11
5.3.4 Check for the suitability of data for extrapolation . 12
5.3.5 Validation of statistical procedures by an example calculation . 12
6 Application of methods to product design and testing .
...