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Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
Automaticky preložený názov:
Štandardná prax pre používanie termínov presnosť a skreslenie v ASTM skúšobnej metódy
NORMA vydaná dňa 1.5.2014
Označenie normy: ASTM E177-14
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.5.2014
Kód tovaru: NS-42972
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
accepted reference value, accuracy, bias, interlaboratory study, precision, precision conditions, repeatability, reproducibility, standard deviation, ICS Number Code 19.020 (Test conditions and procedures in general)
Significance and Use | ||||||||||||
4.1 Part A of the “Blue Book,” 4.2 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 4.3 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 4.3.1 An alternative term for bias is trueness, which has a positive connotation, in that greater bias is associated with less favorable trueness. Trueness is the systematic component of accuracy. 4.4 Accuracy—The term “accuracy,” used in earlier editions of Practice E177, embraces both precision and bias (see 9.3). |
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1. Scope | ||||||||||||
1.1 The purpose of this practice is to present concepts necessary to the understanding of the terms “precision” and “bias” as used in quantitative test methods. This practice also describes methods of expressing precision and bias and, in a final section, gives examples of how statements on precision and bias may be written for ASTM test methods. 1.2 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 requirements prior to use. |
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2. Referenced Documents | ||||||||||||
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