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ASTM D 1749 Document Information:
Title
Standard Practice for Interlaboratory Evaluation of Test Methods Used with Paper and Paper Products
ASTM International
Publication Date:
Jan 1, 1993
Scope:
The purpose of an interlaboratory study is to determine the
variability in results caused by differences among laboratories
following a prescribed test method, the consistency from material
to material of this variability, and the type of additional
standardization needed, if any. The study may be made to obtain
information for improving the test method or to arrive at an
estimate of the precision of an existing method for publication. It
may also include a comparison of alternative test methods.
To achieve the objectives in 1.1 satisfactorily, it is essential
that a sound statistical design be employed in the planning of an
interlaboratory study. This practice gives the basic principles
involved in the planning in order to make the data amenable to
statistical analysis and interpretation.
This practice has been written for the task group chairman
responsible for the preparation or the revision of a standard test
method. It tells him what information he needs in order to properly
plan an interlaboratory study (Sections 1-10), it outlines the
procedure for conducting the study (Section 11), and it gives him
background information for understanding the analysis (Section 12)
and interpretation (Sections 13-15) of the results.
While the services of a statistician are not absolutely
necessary for the design, analysis, and interpretation of
interlaboratory studies, questions often arise that could be
readily answered by a statistician familiar with the analysis used
herein. Hence, the task group chairman should arrange whenever
possible to consult with a statistician both during the planning
and during the analysis and interpretation.
This practice is similar to TAPPI T1200, which details the
analysis using a set of typical data.
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.
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