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ASTM D4460-97(2009)

Historical Reaffirmation

Standard Practice for Calculating Precision Limits Where Values Are Calculated from Other Test Methods

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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.


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.

SDO ASTM: ASTM International
Document Number D4460
Publication Date Dec. 1, 2009
Language en - English
Page Count 3
Revision Level 97(2009)
Supercedes
Committee D04.94
Publish Date Document Id Type View
Nov. 1, 2022 D4460-22A Revision
June 15, 2022 D4460-22 Revision
Nov. 10, 1997 D4460-97 Revision
Jan. 1, 2015 D4460-97R15 Reaffirmation
Dec. 1, 2009 D4460-97R09 Reaffirmation
June 1, 2005 D4460-97R05 Reaffirmation
June 1, 2004 D4460-97R04 Reaffirmation