ASTM E691 - 11 en

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

  • Deze norm is ingetrokken sinds 01-08-2012

73,70 89,18 Incl BTW

Over deze norm

Status Ingetrokken
Aantal pagina's 23
Gepubliceerd op 01-11-2011
Taal Engels

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 ApplicationThis 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:

Referenced Documents2
Summary of Practice4
Significance and Use5
Planning the Interlaboratory Study (ILS)Section
ILS Membership6
Basic Design7
Test Method8
Number of Test Results per Material11
Conducting the Testing Phase of the ILSSection
Pilot Run13
Full Scale Run14
Calculation and Display of StatisticsSection
Calculation of the Statistics15
Tabular and Graphical Display of Statistics16
Data ConsistencySection
Flagging Inconsistent Results17
Task Group Actions19
Examples of Interlaboratory Studies20
Precision Statement InformationSection
Repeatability and Reproducibility21
Theoretical ConsiderationsX1
Index to Selected TermsX2
Tables and Figures
Glucose in Serum Example14, 67, 11
Pentosans in Pulp Example810, 12
Critical Values of Consistency Statistics, h and k5
Glucose in Serum Example 14, 8
Pentosans in Pulp Example 57, 9

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.


ICS-code 19.020
Engelse titel Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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