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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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.

The statistical techniques described in this practice provide adequate information atsm formulating the precision statement of a test method. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Greater variability implies smaller that is, poorer precision and larger imprecision.

A well-developed test method, including a ruggedness test to determine control of test method conditions, is essential. Link to Active This link will always route to the current Active version of the standard.

This information may then be used to prepare a precision statement in accordance with Practice E Numerical measures of the variability between such test results provide inverse measures of the precision of the test method. 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 directions given to ee691 laboratories for conducting the ILS.

Critical Values of Consistency Statistics, h and k. Glucose in Serum Example.

Historical Version s – view previous versions of standard. This standard does not purport to address all of the safety concerns, if any, associated with its use.

Concepts of Test Method Precision. Tabular and Graphical Display of Statistics. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Historical Version s – view previous versions of standard Translated Version s: For a discussion of bias estimation and the relationships between precision, bias, and accuracy, see Practice E Calculation of the Statistics.

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.

This practice may be used in obtaining the needed information as simply as possible. Spreadsheet for E Calculations.

Calculation and Display of Statistics. A measure of the degree of agreement among these test results describes the precision of the test method for that material.

Pentosans in Pulp Example. Number of Test Results per Material. The data obtained in the interlaboratory study may indicate, however, that further effort is needed to improve the test method.