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ASTM International, 05/01/2014
Publisher: ASTM
File Format: PDF
$47.00$94.00
Published:01/05/2014
Pages:59
File Size:1 file , 1.2 MB
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1.1 This practice covers guidelines for evaluating precision and serves as the governing practice for interlaboratory test programs (ITP) used to evaluate precision for test methods as used in the rubber manufacturing and the carbon black industries. This practice uses the basic one way analysis of variance calculation algorithms of Practice E691. Although bias is not evaluated in this practice, it is an essential concept in understanding precision evaluation.
1.2 This practice applies to test methods that have test results expressed in terms of a quantitative continuous variable. Although exceptions may occur, it is in general limited to test methods that are fully developed and in routine use in a number of laboratories.
1.3 Two precision evaluation methods are given that are described as robust statistical procedures that attempt to eliminate or substantially decrease the influence of outliers. The first is a General Precision procedure intended for all test methods in the rubber manufacturing industry, and the second is a specific variation of the general precision procedure designated as Special Precision, that applies to carbon black testing. Both of these procedures use the same uniform level experimental design and the Mandel h and k statistics to review the precision database for potential outliers. However, they use slight modifications in the procedure for rejecting incompatible data values as outliers. The Special Precision procedure is specific as to the number of replicates per database cell or material-laboratory combination.
1.4 This practice is divided into the following sections:
Section
Scope
1
Referenced Documents
2
Terminology
3
Significance and Use
4
Precision Evaluation-General Precision and Special Precision
5
Steps in Organizing an Interlaboratory Test Program (ITP)
6
Overview of the General Precision Analysis Procedure
7
General Precision: Analysis Step 1
8
Preliminary Graphical Data Review
8.1
Calculation of Precision for Original Database
8.2
Detection of Outliers at 5 % Significance Level Using h and k Statistics
8.3
Generation of Revision 1 Database Using Outlier Treatment Option 1 or 2
8.4
General Precision: Analysis Step 2
9
Calculation of Precision for Revision 1 Database
9.1
Detection of Outliers at 2 % Significance Level Using h and k Statistics
Generation of Revision 2 Database Using Outlier Treatment Option 1 or 2
9.1.2
General Precision: Analysis Step 3
10
Calculation of Precision Using Revision 2 Database
10.1
Special Precision Analysis-Carbon Black Testing
11
Format for Precision Table and Clause in Test Method Standards
12
Preparation of Report for Precision Analysis
13
Definitions for Selected Terms Concerned with Precision and Testing
Annex A1
Statistical Model for Interlaboratory Testing Programs
Annex A2
Calculating the h and k Consistency Statistics for Outliers
Annex A3
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