ASTM E691-13 PDF

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)

Section

 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

Section

 Pilot Run

13

 Full Scale Run

14

 

 

Calculation and Display of Statistics

Section

 Calculation of the Statistics

15

 Tabular and Graphical Display of Statistics

16

 

 

Data Consistency

Section

 Flagging Inconsistent Results

17

 Investigation

18

 Task Group Actions

19

 Examples of Interlaboratory Studies

20

 

 

Precision Statement Information

Section

 Repeatability and Reproducibility

21

 

 

Appendixes

Appendix

 Theoretical Considerations

X1

 Index to Selected Terms

X2

 

 

References

 

 

 

Tables and Figures

 

 

Table

 Glucose in Serum Example

1-4, 6-7, 11

 Pentosans in Pulp Example

8-10, 12

 Critical Values of Consistency Statistics, h and k

5

 

 

 

Figure

 Glucose in Serum Example

1-4, 8

 Pentosans in Pulp Example

5-7, 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.

File Size :	1 file , 260 KB
Note :	This product is unavailable in Russia, Ukraine, Belarus
Number of Pages :	22
Published :	05/01/2013
Redline File Size :	2 files , 540 KB