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ASTM D6631-05

(Guide)

Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method

Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method

SIGNIFICANCE AND USE
The purpose of an interlaboratory evaluation, as defined in this guide, is to determine the variability of results obtained in different laboratories on equivalent equipment using a prescribed test method.
The definitions of statistical terms used in this guide are contained in Terminology E 456.
SCOPE
1.1 This guide covers a simplified statistical procedure for planning and conducting interlaboratory evaluations of test methods.

General Information

Status
Historical
Publication Date
30-Jun-2005
ICS
03.120.20 - Product and company certification. Conformity assessment
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.20 - Quality Assurance and Statistics
Current Stage
Ref Project

Relations

Replaces
ASTM D6631-01 - Standard Guide for Committee D01 for Conducting an Interlaboratory Study, and Determining the Precision of a Test Method
Effective Date
01-Jul-2005
Replaced By
ASTM D6631-05(2011) - Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method
Effective Date
01-Jun-2011
Referred By
ASTM D4587-23 - Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings
Effective Date
01-Jul-2005
Referred By
ASTM G154-23 - Standard Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Materials
Effective Date
01-Jul-2005
Referred By
ASTM G141-09(2021) - Standard Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials
Effective Date
01-Jul-2005

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ASTM D6631-05 - Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test MethodASTM D6631-05 - Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method
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ASTM D6631-05 - Standard Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6631–05
Standard Guide for
Committee D01 for Conducting an Interlaboratory Study for
1
the Purpose of Determining the Precision of a Test Method
This standard is issued under the fixed designation D6631; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.1 The amount of information contained in discrete and
ordereddataismuchlessthanincontinuousdata,necessitating
1.1 This guide covers a simplified statistical procedure for
the collection of much more data.
planning and conducting interlaboratory evaluations of test
4.1.2 The sensitivity (the ability to discriminate between
methods.
similar samples) is much less in discrete and ordered data than
2. Referenced Documents continuous data.
2
4.1.3 Since the precision statement relies on the normal
2.1 ASTM Standards:
distribution, and the distributions of discrete and ordered data
E177 Practice for Use of the Terms Precision and Bias in
are usually decidedly non-normal, the normal precision state-
ASTM Test Methods
ment is invalid.
E456 Terminology Relating to Quality and Statistics
4.2 Given these concerns with discrete and ordered data, a
E691 Practice for Conducting an Interlaboratory Study to
simple statement of the results obtained in these types of
Determine the Precision of a Test Method
studies might be the most useful information for a prospective
E1345 Practice for Reducing the Effect of Variability of
user of a test method.
Color Measurement by Use of Multiple Measurements
5. Preliminary
3. Significance and Use
5.1 Flow chart the test method.
3.1 The purpose of an interlaboratory evaluation, as defined
5.2 Survey known sources of information related to the test
in this guide, is to determine the variability of results obtained
method to establish how results are affected by variations in
in different laboratories on equivalent equipment using a
operating conditions, atmospheric conditions, differences be-
prescribed test method.
tween operators, etc. Select what appears to be the optimum
3.2 The definitions of statistical terms used in this guide are
procedure.
contained in Terminology E456.
5.3 Provide instructions for the test method and, without
4. Problem Formulation
comment, observe a laboratory technician perform a test
according to these instructions. Revise any parts of the draft
4.1 The objective of the evaluation should be to clearly
causing difficulty.
define the expected precision of the test method. Within the
5.4 If desirable, make a comparative study with other test
current limits of both the software, and the statistical protocols
methods for measuring the property by using specimens with a
currently available, this effectively restricts the use of this
wide range of values of the property under test (and possibly
guide to test methods which yield results that are continuous.
with wide ranges in other properties).
This generally means a measured quantity, such as pH or
brightness. Results that are discrete (such as counts or pass-
6. Preparation for Interlaboratory Study
fail), or ordered (ranked), present three special problems in the
6.1 Prepare a clear statement of the type of information
creation of a meaningful precision statement:
required from the interlaboratory evaluation.
6.2 Based on the study made in one laboratory (Section 5),
1
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
prepare a proposed master plan for the interlaboratory evalu-
Related Coatings, Materials, and Applications and is the direct responsibility of
ation. Discuss the plan, in an open meeting, if possible, with
Subcommittee D01.20 on Quality Assurance and Statistics.
other participants in the study.
Current edition approved July 1, 2005. Published July 2005. Originally approved
in 2001. Last previous edition approved in 2001 as D6631 – 01. DOI: 10.1520/
6.3 Select the materials to be used in the interlaboratory
D6631-05.
evaluations so as to:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3.1 Cover the applicable range of the property or compo-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on nent to be measured, and
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D6631–05
6.3.2 Represent as many classes of materials as feasible, to 10.2 Intralaboratory Precision is usually ascertained by
which the test method will be applied. hav
...

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