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ASTM-E691:2011 Edition

ASTM-E691:2011 Edition

$58.50

E691-11 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

Published By Publication Date Number of Pages
ASTM 2011 23
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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:

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.

PDF Catalog

PDF Pages PDF Title
2 Scope
Referenced Documents
3 Terminology
Summary of Practice
Significance and Use
4 ILS Membership
Basic Design
Test Method
5 Laboratories
TABLE 1
6 Materials
Number of Test Results per Material
Protocol
7 Pilot Run
Full Scale Run
Calculation of the Statistics
8 TABLE 2
9 Tabular and Graphical Display of Statistics
Flagging Inconsistent Results
TABLE 3
10 Investigation
Task Group Actions
Examples of Interlaboratory Studies
TABLE 4
11 FIG. 1
12 Repeatability and Reproducibility
FIG. 2
13 Keywords
FIG. 3
14 FIG. 4
15 TABLE 5
TABLE 6
16 TABLE 7
TABLE 8
17 FIG. 5
18 FIG. 6
19 FIG. 7
TABLE 9
TABLE 10
20 TABLE 11
TABLE 12
FIG. 8
21 X1. THEORETICAL CONSIDERATIONS
X1.1 Underlying Assumptions of ILS
FIG. 9
22 X1.2 Consistency Statistics
23 X2. INDEX TO SELECTED TERMS

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