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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Historical Version s – view previous versions of standard Translated Version s: 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.
Glucose in Serum Example. Calculation and Display of Statistics.
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 the laboratories for conducting the ILS. Pentosans in Pulp Example. This standard does not purport to address all of the astk concerns, if any, associated with its use. Tabular and Graphical Display of Statistics.
Calculation of the Statistics. Knowledge of the test method precision is useful in commerce and in technical work when comparing test results against w691 values such as specification limits or between data sources different laboratories, instruments, etc.
Numerical measures of the variability between such test results provide inverse measures of the precision of the test method.
This practice may be used in obtaining the needed information as simply as possible. Number of Test Results per Material.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A measure of the degree of agreement among these test results describes the precision of the test method for that material.
Link to Active This link will always route to the current Active version of the standard. Concepts of Test Method Precision. A well-developed test method, including a ruggedness test to determine control of test method conditions, is essential.
This information may then be used to prepare a precision statement in accordance with Practice E For a discussion of bias estimation and the relationships between precision, bias, and accuracy, see Practice E Critical Values of Consistency Statistics, h and k.
The statistical techniques described in this practice e6991 adequate information for formulating the precision statement of a test method.
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 qstm method. The data obtained in the interlaboratory study may indicate, however, that further effort is needed to improve the test method.
Spreadsheet for E Calculations. Greater variability implies smaller that is, poorer precision and larger imprecision.