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Standard Practice for Calculating Precision Limits Where Values are Calculated from Other Test Methods
STANDARD published on 1.12.2009
Designation standards: ASTM D4460-97(2009)
Note: WITHDRAWN
Publication date standards: 1.12.2009
SKU: NS-27325
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: American technical standard
Category: Technical standards ASTM
Keywords:
precision limits, standard deviation, Calculating test values, Data analysis--paving applications, Precision, Random variables/variation, Statistical methods, Variability, ICS Number Code 93.080.20 (Road construction materials)
Significance and Use | ||||||||
Precision limits for a test result that is calculated by addition, subtraction, multiplication, or division of two other test results that have valid precision limits can be calculated directly. This saves the cost and delay of conducting an interlaboratory study. At the heart of statistical theory is the concept of a frequency distribution of a random variable. The precision limit of the random variable is determined by the standard deviation of the variable. The standard deviation of a random variable that is the sum, difference, product, or quotient of two other random variables can be calculated simply so long as the individual variables are independent and the standard deviations are small relative to their mean values. These restrictions are usually met in ASTM methods. In those cases where these restrictions are not met, other methods can be used. Only cases complying with the restrictions are covered in this standard. |
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1. Scope | ||||||||
1.1 This practice covers techniques for calculating precision limits when values are calculated from two other methods having precision limits. 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 limitations prior to use. |
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2. Referenced Documents | ||||||||
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