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ASTM E691-05

Historical Revision

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

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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.

1.1.1 A computer software package for performing the calculations and producing the tables and graphs associated with Practice E 691. This software can be run on PC compatible computers, and hard copy tables and graphs can be printed on dot-matrix printers.

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 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.


SDO ASTM: ASTM International
Document Number E691
Publication Date Nov. 1, 2005
Language en - English
Page Count 23
Revision Level 05
Supercedes
Committee E11.20
Publish Date Document Id Type View
April 1, 2023 E0691-23 Revision
May 15, 2022 E0691-22 Revision
Dec. 1, 2021 E0691-21 Revision
Oct. 1, 2020 E0691-20 Revision
Sept. 1, 2019 E0691-19E01 Revision
Sept. 1, 2019 E0691-19 Revision
April 1, 2018 E0691-18 Revision
Oct. 1, 2016 E0691-16 Revision
Oct. 1, 2015 E0691-15 Revision
April 1, 2014 E0691-14 Revision
May 1, 2013 E0691-13 Revision
Aug. 1, 2012 E0691-12 Revision
Nov. 1, 2011 E0691-11 Revision
Sept. 1, 2009 E0691-09E01 Revision
Sept. 1, 2009 E0691-09 Revision
Oct. 1, 2008 E0691-08 Revision
Nov. 1, 2005 E0691-05 Revision
May 10, 1999 E0691-99 Revision