ASTM-D4483 2005

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D4483-05a Standard Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries

Published By	Publication Date	Number of Pages
ASTM	2005	60

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Description

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 E 691. 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:

1.5 Six annexes are presented; these serve as supplements to the main body of this practice. are given mainly as background information that is important for a full understanding of precision evaluation. contain detailed instructions and procedures needed to perform the operations as called for in various parts of the practice. The use of these annexes in this capacity avoids long sections of involved instruction in the main body of this practice. This allows for a better presentation and understanding of the central concepts involved in the evaluation of precision. is also important; it gives a complete example of precision evaluation that illustrates all of the procedures and options likely to be encountered in any precision evaluation, from the simple to the most complex.

This standard does not purport to address all of the safety concerns, if any, 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
1	Scope
2	Referenced Documents Terminology
4	Significance and Use
5	Precision Evaluation: General Precision and Special Precision
6	Steps in Organizing an Interlaboratory Test Program
7	Overview of General Precision Analysis Procedure TABLE 1
8	FIG. 1
9	General Precision: Analysis Step 1
10	TABLE 2 TABLE 3
11	General Precision: Analysis Step 2 General Precision: Analysis Step 3
12	Special Precision Analysis—Carbon Black Testing TABLE 4 TABLE 5 TABLE 6
13	Format for Precision Table and Section or Clause in Test Method Standards
14	Report for Precision Evaluation ITP Keywords
15	A1. DEFINITIONS FOR SELECTED TERMS CONCERNED WITH PRECISION AND TESTING A1.1 General Background A1.2 Basic Statistical Definitions
16	A2. STATISTICAL MODEL FOR INTERLABORATORY TESTING PROGRAMS A2.1 Introduction
17	A2.2 General Model A2.3 Specific Model Format
18	A2.4 Evaluating Process and Measurement Variance A2.5 Relating the Bias and Random Terms to Measurement Precision
20	A3. CALCULATING THE h AND k DATA CONSISTENCY STATISTICS A3.1 General Background A3.2 Defining and Calculating the h Statistic A3.3 Defining and Calculating the k Statistic
21	A3.4 Identification of Outliers Using the Critical h and k Values A4. SPREADSHEET CALCULATION FORMULAS FOR PRECISION PARAMETERS, RECOMMENDED SPREADSHEET TABLE LAYOUT AND DATA CALCULATION SEQUENCE A4.1 Calculation Formulas TABLE A3.1
22	A4.2 Table Layout for Spreadsheet Calculations
24	A4.3 Sequence of Database Calculations for Precision
25	A5. PROCEDURE FOR CALCULATING REPLACEMENT VALUES FOR DELETED OUTLIERS A5.1 Introduction A5.2 The Replacement Procedure
26	A5.3 A5.4 A5.5
27	A5.6 A6. AN EXAMPLE OF GENERAL PRECISION EVALUATION—MOONEY VISCOSITY TESTING A6.1 Introduction
28	A6.2 Part 1: Outlier Replacement—Analysis Step 1
29	FIG. A6.1
30	A6.3 Part 1: Outlier Replacement – Analysis Step 2 FIG. A6.2
31	FIG. A6.3
32	A6.4 Part 1: Outlier Replacement—Analysis Step 3 A6.5 Part 2: General Precision Analysis—Option 1: Outlier Deletion A6.6 Part 2: Outlier Deletion—Analysis Step 2 FIG. A6.4
33	FIG. A6.5
34	A6.7 Part 2: Outlier Deletion—Analysis Step 3 A6.8 Discussion of Precision Results: Option 1 versus Option 2
35	TABLE A6.1
36	TABLE A6.2 TABLE A6.3
37	TABLE A6.4 TABLE A6.5
38	TABLE A6.6
39	TABLE A6.7
40	TABLE A6.8 TABLE A6.9
41	TABLE A6.10 TABLE A6.11
42	TABLE A6.12
43	TABLE A6.13
44	TABLE A6.14
45	TABLE A6.15 TABLE A6.16
46	TABLE A6.17 TABLE A6.18
47	TABLE A6.19 TABLE A6.20
48	TABLE A6.21
49	TABLE A6.22 TABLE A6.23
50	TABLE A6.24 TABLE A6.25
51	TABLE A6.26
52	TABLE A6.27
53	TABLE A6.28
54	TABLE A6.29 TABLE A6.30
55	TABLE A6.31 TABLE A6.32
56	TABLE A6.33 TABLE A6.34
57	TABLE A6.35
58	TABLE A6.36
59	TABLE A6.37 TABLE A6.38
60	REFERENCES TABLE A6.39

Additional information

Standard Title	D4483-05a Standard Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
Published Code	ASTM
Publication Date	2005
Pages Count	60

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