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Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

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Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications


1.1 This practice is intended to assist the various technical committees in the use of uniform methods of indicating the number of digits which are to be considered significant in specification limits, for example, specified maximum values and specified minimum values. Its aim is to outline methods which should aid in clarifying the intended meaning of specification limits with which observed values or calculated test results are compared in determining conformance with specifications. Reference to this practice is valid only when a choice of method has been indicated, that is, either absolute method or rounding method .

1.2 This practice is intended to be used in determining conformance with specifications when the applicable ASTM specifications or standards make direct reference to this practice.

1.3 This practice describes two commonly accepted methods of rounding data, identified as the Absolute Method and the Rounding Method. In the application of this practice to a specific material or materials it is essential to specify which method is intended to apply. In the absence of such specification, reference to this practice, which expresses no preference as to which method should apply, would be meaningless. The choice of method is arbitrary, depending upon the current practice of the particular branch of industry or technology concerned, and should therefore be specified in the prime publication.

1.4 Section 7 of this practice gives guidelines for use in recording, calculating, and reporting the final result for test data.


Calculating test values; Conformance; Data analysis; Digits; Observed values; Rounding-off method; Significant figures; Specifications; Statistical methods; using significant digits in test data to determine conformance with; specifications, practice,; Limiting values; indicating places of figures considered significant in specified; limiting values, practice; ICS Number Code 17.020 (Metrology and measurement in general); 19.020 (Test conditions and procedures in general)

To find similar documents by ASTM Volume:

14.02 (General Test Methods; Forensic Psychophysiology; Forensic Sciences; Terminology; Conformity Assessment; Statistical Methods; Nanotechnology; Forensic Engineering; Manufacture of Pharmaceutical Products)

To find similar documents by classification:

17.020 (Metrology and measurement in general Including measuring instruments in general, preferred numbers, standard measures, general aspects of reference materials, etc. Quantities and units, see 01.060 Chemical reference materials, see 71.040.30)

19.020 (Test conditions and procedures in general)

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Publication Date

March 15, 1993

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Page Count

4 pages

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