Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods

Importancia y uso:

4.1 Precision and bias describe performance of a test method by summarizing random error and systematic error. They depend on the sample type and the testing situation that governs the sources of variability that apply.

4.2 Part A of the “Blue Book,” Form and Style for ASTM Standards, requires that all test methods include statements of precision and bias based on an interlaboratory test program. This practice describes and gives examples for the calculation of test precision and assessment of bias, and provides guidance for their use in statements about test methods.

4.2.1 Precision—A statement of precision allows potential users of a test method to assess in general terms the test method’s usefulness with respect to variability in proposed applications. A statement of precision is not intended to exhibit values that can be exactly duplicated in every user’s laboratory. Instead, the statement provides guidelines as to the magnitude of variability that can be expected between test results when the method is used in one, or in two or more, reasonably competent laboratories. For a discussion of precision, see 8.1.

4.2.2 Bias—A statement of bias furnishes guidelines on the relationship between a set of typical test results produced by the test method under specific test conditions and a related set of accepted reference values (see 9.1).

Subcomité:

E11.20

Referida por:

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Volúmen:

14.01

Número ICS:

19.020 (Test conditions and procedures in general)

Palabras clave:

accepted reference value; accuracy; bias; interlaboratory study; precision; precision conditions; repeatability; reproducibility; standard deviation;