ASTM D6300-99

Designation: D 6300 – 99 An American National Standard
Standard Practice for
Determination of Precision and Bias Data for Use in Test
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Methods for Petroleum Products and Lubricants
This standard is issued under the fixed designation D 6300; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Both Research Report D02:1007, Manual on Determining Precision Data for ASTM Methods on
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Petroleum Products and Lubricants (1) and the ISO 4259, benefitted greatly from more than 50 years
of collaboration between ASTM and the Institute of Petroleum (IP) in the UK. The more recent work
was documented by the IP and has become ISO 4259.
ISO 4259 encompasses both the determination of precision and the application of such precision
data. In effect, it combines the type of information in RR D02:1007 regarding the determination of the
precision estimates and the type of information in Practice D 3244 for the utilization of test data. The
following practice, intended to replace RR D02:1007, differs slightly from related portions of the ISO
standard. This new practice is consistent with the computer software, Calculation of Precision Data:
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Petroleum Test Methods.
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1. Scope Determine Conformance with Specifications
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E 456 Terminology Relating to Quality and Statistics
1.1 This practice covers the necessary preparations and
E 691 Practice for Conducting an Interlaboratory Study to
planning for the conduct of interlaboratory programs for the
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Determine the Precision of a Test Method
development of estimates of precision (determinability, repeat-
2.2 ISO Standards:
ability, and reproducibility) and of bias (absolute and relative),
ISO 4259 Petroleum Products-Determination and Applica-
and further presents the standard phraseology for incorporating
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tion of Precision Data in Relation to Methods of Test
such information into standard test methods.
1.2 This practice is generally limited to homogeneous prod-
3. Terminology
ucts with which serious sampling problems do not normally
3.1 Definitions:
arise.
3.1.1 analysis of variance (ANOVA), n—a procedure for
1.3 This practice may not be suitable for solid or semisolid
dividing the total variation of a set of data into two or more
products such as petroleum coke, industrial pitches, paraffin
parts, one of which estimates the error due to selecting and
waxes, greases, or solid lubricants when the heterogeneous
testing specimens and the other part(s) possible sources of
properties of the substances create sampling problems. In such
added variation. D 123
instances, use Practice E 691 or consult a trained statistician.
3.1.2 bias, n—the difference between the population mean
2. Referenced Documents of the test results and an accepted reference value. E 456
3.1.3 bias, relative, n—the difference between the popula-
2.1 ASTM Standards:
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tion mean of the test results and an accepted reference value,
D 123 Terminology Relating to Textiles
which is the agreed upon value obtained using an accepted
D 3244 Practice for Utilization of Test Data to Determine
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reference method for measuring the same property.
Conformance with Specifications
3.1.4 degrees of freedom, n—the divisor used in the calcu-
E 29 Practice for Using Significant Digits in Test Data to
lation of variance.
3.1.4.1 Discussion—This definition applies strictly only in
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This practice is under the jurisdiction of ASTM Committee D-2 on Petroleum
the simplest cases. Complete definitions are beyond the scope
Products and Lubricants and is the direct responsibility of Subcommittee D02.94 on
of this practice. ISO 4259
Quality Assurance and Statistics.
Current edition approved Nov. 10, 1999. Published January 2000. Originally 3.1.5 determinability, n—a quantitative measure of the vari-
published as D 6300 – 98. Last previous edition D 6300 – 98.
ability associated with the same operator in a given laboratory
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The bold numbers in parentheses refer to a list of references at the end of this
practice.
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Available from ASTM. Reference number PCN 13-402000-12. Annual Book of ASTM Standards, Vol 14.02.
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Annual Book of ASTM Standards, Vol 07.01. Available from International Organization for Standardization, 1 rue de
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Annual Book of ASTM Standards, Vol 05.02. Varembé, Case postale 56, CH-1211 Geneva 20, Switzerland.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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D 6300
obtaining successive determined values using the same appa- test sample when applying the same method. It is defined as the
ratus for a series of operations leading to a single result; it is 95 % confidence limit for the difference between two such
defined as that difference between two such single determined single and
...