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ASTM E691 PDF

27 Apr ASTM E Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method aids in collecting the. 24 Dec This standard is issued under the fixed designation E ; the number . 1 This practice is under the jurisdiction of ASTM Committee E on. 21 Feb “ASTM E–87 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method.” Journal of Quality.

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Numerical measures of the variability between such test results provide inverse measures of the precision of the test method. Number of Test Results per Material. Greater variability implies smaller that is, poorer precision and larger imprecision. This information may then be used to prepare a precision statement in accordance with Practice E Historical Version s – satm previous versions of standard.

Concepts of Test Method Precision. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Tabular and Graphical Display of Statistics. The data obtained in the interlaboratory study may indicate, however, that further effort is needed to improve the test method.

Calculation of the Statistics. This practice may be used in obtaining the needed information as simply as possible. The statistical techniques described in this practice provide adequate information for formulating the precision statement of a test method.

A measure of the degree of agreement among these test results describes the precision of the test method for that material. Historical Version s – view previous versions of standard Translated Version s: In this practice, the term test method is used both for the actual measurement process and for the written description of the process, while the term protocol is used for the e6911 given to ashm laboratories for conducting the ILS.

Link to Active This link will always route to the current Active version of the standard. However, when accepted reference values are available for the property levels, the test result data obtained according to this practice may be used in estimating the bias of the test method.

Glucose in Serum Example.

For a discussion of bias estimation and the relationships between precision, bias, and accuracy, see Practice E Calculation and Display of Statistics.

Knowledge of the test method precision is useful in commerce and in technical work when comparing test results against standard values such as specification limits or between data sources different laboratories, instruments, etc.

Critical Values of Consistency Statistics, h and k. A well-developed test method, including a ruggedness test to determine control of test method conditions, is essential.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of aetm limitations prior to use. Pentosans in Pulp Example.

Spreadsheet for E Calculations. This standard does not purport to address all of the safety concerns, if any, associated with its use.