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ASTM International - ASTM E691-08

Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

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Organization: ASTM International
Publication Date: 1 October 2008
Status: inactive
Page Count: 23
significance And Use:

ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as... View More

scope:

1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in this practice provide adequate information for formulating the precision statement of a test method.

1.2 This practice does not concern itself with the development of test methods but rather with gathering the information needed for a test method precision statement after the development stage has been successfully completed. The data obtained in the interlaboratory study may indicate, however, that further effort is needed to improve the test method.

1.3 Since the primary purpose of this practice is the development of the information needed for a precision statement, the experimental design in this practice may not be optimum for evaluating materials, apparatus, or individual laboratories.

1.4 Field of Application-This practice is concerned exclusively with test methods which yield a single numerical figure as the test result, although the single figure may be the outcome of a calculation from a set of measurements.

1.4.1 This practice does not cover methods in which the measurement is a categorization, such as a go-no-go allocation (two categories) or a sorting scheme into two or more categories. For practical purposes, the discontinuous nature of measurements of these types may be ignored when a test result is defined as an average of several individual measurements. Then, this practice may be applicable, but caution is required and a statistician should be consulted.

1.5 The information in this practice is arranged as follows:

Section
Scope1
Referenced Documents2
Terminology3
Summary of Practice4
Significance and Use5
Planning the Interlaboratory Study (ILS)
ILS Membership6
Basic Design7
Test Method8
Laboratories9
Section
Materials10
Number of Test Results per Material11
Protocol12
Conducting the Testing Phase of the ILS
Pilot Run13
Full Scale Run14
Section
Calculation and Display of Statistics
Calculation of the Statistics15
Tabular and Graphical Display of Statistics16
Data Consistency
Flagging Inconsistent Results17
Investigation18
Task Group Actions19
Examples of Interlaboratory Studies20
Precision Statement Information
Repeatability and Reproducibility21
Appendixes
Theoretical ConsiderationsA1
Index to Selected TermsA2
References
Tables and Figures
TablesTable
Glucose in Serum Example1-4 & 6-7
Pentosans in Pulp Example8-11
Critical Values of Consistency Statistics, h and k5
FiguresFig.
Glucose in Serum Example1-5
Pentosans in Pulp Example6-10

1.6 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Document History

October 1, 2020
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
September 1, 2019
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
September 1, 2019
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
April 1, 2018
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
October 1, 2016
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
October 1, 2015
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as...
April 1, 2014
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
May 1, 2013
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
August 1, 2012
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
November 1, 2011
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
September 1, 2009
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
September 1, 2009
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
ASTM E691-08
October 1, 2008
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
November 1, 2005
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
May 10, 1999
Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
1.1 This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in...
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