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ASTM International, 05/01/2013
Publisher: ASTM
File Format: PDF
$43.00$86.00
Published:01/05/2013
Pages:22
File Size:1 file , 260 KB
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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.
1.2 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
Scope
1
Referenced Documents
2
Terminology
3
Summary of Practice
4
Significance and Use
5
Planning the Interlaboratory Study (ILS)
ILS Membership
6
Basic Design
7
Test Method
8
Laboratories
9
Materials
10
Number of Test Results per Material
11
Protocol
12
Conducting the Testing Phase of the ILS
Pilot Run
13
Full Scale Run
14
Calculation and Display of Statistics
Calculation of the Statistics
15
Tabular and Graphical Display of Statistics
16
Data Consistency
Flagging Inconsistent Results
17
Investigation
18
Task Group Actions
19
Examples of Interlaboratory Studies
20
Precision Statement Information
Repeatability and Reproducibility
21
Appendixes
Appendix
Theoretical Considerations
X1
Index to Selected Terms
X2
References
Tables and Figures
Table
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