SIST ISO 22514-4:2017
Statistical methods in process management - Capability and performance - Part 4: Process capability estimates and performance measures
Statistical methods in process management - Capability and performance - Part 4: Process capability estimates and performance measures
ISO 22514-4:2016 describes process capability and performance measures that are commonly used.
Méthodes statistiques dans la gestion de processus - Aptitude et performance - Partie 4: Estimations de l'aptitude de processus et mesures de performance
Statistične metode za obvladovanje procesov - Zmogljivost in delovanje - 4. del: Ocene zmogljivosti procesov in merila za delovanje
Ta del standarda ISO 22514 opisuje zmogljivost procesov in merila učinkovitosti, ki se običajno uporabljajo.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST-TP ISO/TR 22514-4:2010
6WDWLVWLþQHPHWRGH]DREYODGRYDQMHSURFHVRY=PRJOMLYRVWLQGHORYDQMHGHO
2FHQH]PRJOMLYRVWLSURFHVRYLQPHULOD]DGHORYDQMH
Statistical methods in process management - Capability and performance - Part 4:
Process capability estimates and performance measures
Méthodes statistiques dans la gestion de processus - Aptitude et performance - Partie 4:
Estimations de l'aptitude de processus et mesures de performance
Ta slovenski standard je istoveten z: ISO 22514-4:2016
ICS:
03.120.30 8SRUDEDVWDWLVWLþQLKPHWRG Application of statistical
methods
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 22514-4
First edition
2016-08-01
Statistical methods in process
management — Capability and
performance —
Part 4:
Process capability estimates and
performance measures
Méthodes statistiques dans la gestion de processus — Aptitude et
performance —
Partie 4: Estimations de l’aptitude de processus et mesures de
performance
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Symbols and abbreviated terms . 1
2.1 Symbols . 1
2.2 Abbreviated terms . 3
3 Basic concepts used for process capability and performance . 3
3.1 General . 3
3.2 Location . 3
3.3 Dispersion . 3
3.3.1 Inherent dispersion . 3
3.3.2 Total dispersion . 3
3.3.3 Short-term dispersion . 3
3.4 Mean square error (MSE) . 4
3.5 Reference limits . 4
3.6 Reference interval (also known as process spread) . 4
4 Capability . 4
4.1 General . 4
4.2 Process capability . 6
4.2.1 Normal distribution . 6
4.2.2 Non-normal distribution. 7
4.3 Process location . 7
4.4 Process capability indices for measured data . 8
4.4.1 General. 8
4.4.2 C index (for the normal distribution) . 9
p
4.4.3 C index (for the normal distribution) .10
pk
4.4.4 C index for unilateral tolerances .10
pk
4.5 Process capability indices for measured data (non-normal) .10
4.5.1 General.10
4.5.2 Probability paper method .11
4.5.3 Pearson curves method .11
4.5.4 Distribution identification method .12
4.6 Alternative method for describing and calculating process capability estimates .12
4.7 Other capability measures for continuous data .13
4.7.1 Process capability fraction (PCF) .13
4.7.2 Indices when the specification limit is one-sided or no specification limit
is given .13
4.8 Assessment of proportion out-of-specification (normal distribution) .15
5 Performance .16
5.1 General .16
5.2 Process performance indices for measured data (normal distribution) .16
5.2.1 P index .16
p
5.2.2 P index .17
pk
5.3 Process performance indices for measured data (non-normal distribution) .17
5.3.1 General.17
5.3.2 Probability paper method .17
5.3.3 Pearson curves method .18
5.3.4 Distribution identification method .18
5.4 Other performance indices for measured data .18
5.5 Assessment of proportion out-of-specification for a normal distribution of the
total distribution .18
6 Reporting process capability and performance indices .19
Annex A (informative) Estimating standard deviations .21
Annex B (informative) Estimating capability and performance measures using Pearson
curves — Procedure and example .23
Annex C (informative) Distribution identification .37
Annex D (informative) Confidence intervals .42
Bibliography .44
iv © ISO 2016 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is Technical Committee ISO/TC 69, Applications of
statistical methods, Subcommittee SC 4, Applications of statistical methods in process management.
This first edition of ISO 22514-4 cancels and replaces ISO/TR 22514-4:2007, which has been technically
revised.
ISO 22514 consists of the following parts, under the general title Statistical methods in process
management — Ca
...
INTERNATIONAL ISO
STANDARD 22514-4
First edition
2016-08-01
Statistical methods in process
management — Capability and
performance —
Part 4:
Process capability estimates and
performance measures
Méthodes statistiques dans la gestion de processus — Aptitude et
performance —
Partie 4: Estimations de l’aptitude de processus et mesures de
performance
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Symbols and abbreviated terms . 1
2.1 Symbols . 1
2.2 Abbreviated terms . 3
3 Basic concepts used for process capability and performance . 3
3.1 General . 3
3.2 Location . 3
3.3 Dispersion . 3
3.3.1 Inherent dispersion . 3
3.3.2 Total dispersion . 3
3.3.3 Short-term dispersion . 3
3.4 Mean square error (MSE) . 4
3.5 Reference limits . 4
3.6 Reference interval (also known as process spread) . 4
4 Capability . 4
4.1 General . 4
4.2 Process capability . 6
4.2.1 Normal distribution . 6
4.2.2 Non-normal distribution. 7
4.3 Process location . 7
4.4 Process capability indices for measured data . 8
4.4.1 General. 8
4.4.2 C index (for the normal distribution) . 9
p
4.4.3 C index (for the normal distribution) .10
pk
4.4.4 C index for unilateral tolerances .10
pk
4.5 Process capability indices for measured data (non-normal) .10
4.5.1 General.10
4.5.2 Probability paper method .11
4.5.3 Pearson curves method .11
4.5.4 Distribution identification method .12
4.6 Alternative method for describing and calculating process capability estimates .12
4.7 Other capability measures for continuous data .13
4.7.1 Process capability fraction (PCF) .13
4.7.2 Indices when the specification limit is one-sided or no specification limit
is given .13
4.8 Assessment of proportion out-of-specification (normal distribution) .15
5 Performance .16
5.1 General .16
5.2 Process performance indices for measured data (normal distribution) .16
5.2.1 P index .16
p
5.2.2 P index .17
pk
5.3 Process performance indices for measured data (non-normal distribution) .17
5.3.1 General.17
5.3.2 Probability paper method .17
5.3.3 Pearson curves method .18
5.3.4 Distribution identification method .18
5.4 Other performance indices for measured data .18
5.5 Assessment of proportion out-of-specification for a normal distribution of the
total distribution .18
6 Reporting process capability and performance indices .19
Annex A (informative) Estimating standard deviations .21
Annex B (informative) Estimating capability and performance measures using Pearson
curves — Procedure and example .23
Annex C (informative) Distribution identification .37
Annex D (informative) Confidence intervals .42
Bibliography .44
iv © ISO 2016 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is Technical Committee ISO/TC 69, Applications of
statistical methods, Subcommittee SC 4, Applications of statistical methods in process management.
This first edition of ISO 22514-4 cancels and replaces ISO/TR 22514-4:2007, which has been technically
revised.
ISO 22514 consists of the following parts, under the general title Statistical methods in process
management — Capability and performance:
— Part 1: General principles and concepts
— Part 2: Process capability and performance of time-dependent process models
— Part 3: Machine performance studies for measured data on discrete parts
— Part 4: Process capability estimates and performance measures
— Part 5: Process capability estimates and performance for attributive characteristics
— Part 6: Process capability statistics for characteristics following a multivariate normal distribution
— Part 7: Capability of measurement processes
— Part 8: Machine performance of a multi-state production process
Introduction
Many organizations have embarked upon a continuous improvement strategy. To comply with such a
strategy, any organization will need to evaluate the capability and performance of its key processes.
The methods described in this part of ISO 22514 are intended to assist any management in this respect.
These evaluations need t
...
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