Standard Guide for Statistical Procedures to Use in Developing and Applying Test Methods

SIGNIFICANCE AND USE
All ASTM test methods are required to include statements on precision and bias.  
Since ASTM began to require all test methods to have precision and bias statements that are based on interlaboratory test methods, there has been increased concern regarding what statistical experiments and procedures to use during the development of the test methods. Although there exists a wide range of statistical procedures, there is a small group of generally accepted techniques that are very beneficial to follow. This document is designed to provide a brief overview of these procedures and to suggest an appropriate sequence of carrying out these procedures.
Statistical procedures often result in interpretations that are not absolutes. Sometimes the information obtained may be inadequate or incomplete, which may lead to additional questions and the need for further experimentation. Information outside the data is also important in establishing standards and in the interpretation of numerical results.
SCOPE
1.1 This guide identifies statistical procedures for use in developing new test methods or revising or evaluating existing test methods, or both.
1.2 This guide also cites statistical procedures especially useful in the application of test methods.

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Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:E1488–08
Standard Guide for
Statistical Procedures to Use in Developing and Applying
1
Test Methods
This standard is issued under the fixed designation E 1488; 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 3.1.1 statistical procedures, n—the organized techniques
and methods used to collect, analyze, and interpret data.
1.1 This guide identifies statistical procedures for use in
3.1.1.1 Discussion—Statistical procedures include the sam-
developing new test methods or revising or evaluating existing
plingconsiderationsortheexperimentdesignforthecollection
test methods, or both.
of data, or both, and the numerical and graphical approaches to
1.2 This guide also cites statistical procedures especially
summarize and analyze the collected data.
useful in the application of test methods.
3.2 For all other formal definitions of statistical terms, see
2. Referenced Documents Terminology E 456.
2
2.1 ASTM Standards:
4. Significance and Use
E 177 Practice for Use of the Terms Precision and Bias in
4.1 All ASTM test methods are required to include state-
ASTM Test Methods
4
ments on precision and bias.
E 178 Practice for Dealing With Outlying Observations
4.2 Since ASTM began to require all test methods to have
E 456 Terminology Relating to Quality and Statistics
precision and bias statements that are based on interlaboratory
E 691 Practice for Conducting an Interlaboratory Study to
test methods, there has been increased concern regarding what
Determine the Precision of a Test Method
statistical experiments and procedures to use during the devel-
E 1169 Practice for Conducting Ruggedness Tests
opment of the test methods.Although there exists a wide range
E 2282 Guide for Defining the Test Result of a Test Method
of statistical procedures, there is a small group of generally
E 2489 Practice for Statistical Analysis of One-Sample and
accepted techniques that are very beneficial to follow. This
Two-Sample Interlaboratory Proficiency Testing Programs
document is designed to provide a brief overview of these
E 2554 Practice for Estimating and Monitoring the Uncer-
procedures and to suggest an appropriate sequence of carrying
tainty of Test Results of a Test Method in a Single
out these procedures.
Laboratory Using a Control Sample Program
4.3 Statistical procedures often result in interpretations that
E 2587 Practice for Use of Control Charts in Statistical
are not absolutes. Sometimes the information obtained may be
Process Control
inadequate or incomplete, which may lead to additional ques-
2.2 ISO Standards:
tions and the need for further experimentation. Information
ISO 17025 General Requirements for the Competence of
3
outside the data is also important in establishing standards and
Testing and Calibration Laboratories
in the interpretation of numerical results.
ISO Guide to the Expression of Uncertainty in Measure-
3
ment
5. Summary of Guide
3. Terminology 5.1 Outlined below is a suggested sequence of four phases
useful in the development of a test method. A flowchart is
3.1 Definitions:
provided in Fig. 1. Such a sequence of analyses may need to be
modified in specific situations. The assistance of a qualified
1
This guide is under the jurisdiction of ASTM Committee E11 on Quality and
statistician is recommended at each review phase.
Statistics and is the direct responsibility of Subcommittee E11.20 on Test Method
5.2 Design Phase:
Evaluation and Quality Control.
Current edition approved May 15, 2008. Published July 2008. Originally
5.2.1 This phase includes the formalization of the scope and
e1
approved in 1992. Last previous edition approved in 2002 as E 1488 – 02 .
the significance and use sections. It may include determining
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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
4
the ASTM website. See the Form and Style Manual for ASTM Standards that specifies, when
3
Available from American National Standards Institute, 11 W. 42nd St., 13th possible, precision statements shall be estimated based on the results of an
Floor, New York, NY 10036. interlaboratory test program.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E1488–08
FIG. 1 Sequence of Steps
the purpose and describing a general approach to the test 5.4.3 Analysis of Variability—Statistically designed exper
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
e1
Designation:E1488–02 Designation: E 1488 – 08
Standard Guide for
Statistical Procedures to Use in Developing and Applying
1
Test Methods
This standard is issued under the fixed designation E 1488; 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
e NOTE—The introduction was deleted editorially in March 2003.
1. Scope
1.1 This guide identifies statistical procedures for use in developing new test methods or revising or evaluating existing test
methods, or both.
1.2 This guide also cites statistical procedures especially useful in the application of test methods.
2. Referenced Documents
2.1 ASTM Standards:
E29Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2
E105Practice for Probability Sampling of Materials
2
E122Practice for Choice of Sample Size to Estimate a Measure of Quality for a Lot or Process
2 2
E141Practice for Acceptance of Evidence Based on the Results of Probability Sampling ASTM Standards:
E 177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E 178 Practice for Dealing withWith Outlying Observations
E 456 Terminology Relating to Quality and Statistics
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E 1169Guide Practice for Conducting Ruggedness Tests
2
E1301Guide for Proficiency Testing by Interlaboratory Comparisons
2
E1325Terminology Relating to Design of Experiments
2
E1402Terminology Relating to Sampling 2282 Guide for Defining the Test Result of a Test Method
E 2489 Practice for Statistical Analysis of One-Sample and Two-Sample Interlaboratory Proficiency Testing Programs
E 2554 Practice for Estimating and Monitoring the Uncertainty of Test Results of a Test Method in a Single Laboratory Using
a Control Sample Program
E 2587 Practice for Use of Control Charts in Statistical Process Control
2.2 ISO Standards:
ISO5725 Accuracy (Trueness and Precision) of Measurement Methods and Results
3
ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories
3
ISO Guide to the Expression of Uncertainty in Measurement
3. Terminology
3.1 Definitions:
3.1.1 statistical procedures, n—the organized techniques and methods used to collect, analyze, and interpret data.
3.1.1.1 Discussion—Statistical procedures include the sampling considerations or the experiment design for the collection of
data, or both, and the numerical and graphical approaches to summarize and analyze the collected data.
3.2 For all other formal definitions of statistical terms, see Terminology E 456.
1
ThisguideisunderthejurisdictionofASTMCommitteeE11onQualityandStatisticsandisthedirectresponsibilityofSubcommitteeE11.20onTestMethodEvaluation
and Quality Control.
Current edition approved Oct. 10, 2002. Published December 2002. Originally published as E1488–92. Last previous edition E1488–96.
e1
Current edition approved May 15, 2008. Published July 2008. Originally approved in 1992. Last previous edition approved in 2002 as E 1488 – 02 .
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 14.02.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute, 11 W. 42nd St., 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E1488–08
4. Significance and Use
4
4.1 All ASTM test methods are required to include statements on precision and bias.
4.2 Since ASTM began to require all test methods to have precision and bias statements that are based on interlaboratory test
methods, there has been increased concern regarding what statistical experiments and procedures to use during the development
of the test methods. Although there exists a wide range of statistical procedures, there is a small group of generally accepted
techniques that are very beneficial to follow. This document is designed to provide a brief overview of these procedures and to
suggest an appropriate sequence of carrying out these procedures.
FIG. 1 Sequence of Steps
4.3 Statistical proc
...

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