SYMPOSIA PAPER Published: 01 January 1950

Use of Statistics to Determine Precision of Test Methods


Some recent studies of A.S.T.M. Method D 877 - 46 T2 for the Determination of the Dielectric Streng h of Insulating Oils provide a good illustration of the types of statistical problems encountered in the study of a test method.

These measurements are an example of a case of non-homogeneous measurements. An exposition is given of a method of taking repeated differences in a set of observations. By this statistical technique the errors of measurement may be isolated from the over-all dispersion which includes sampling and possibly other components. It is pointed out tha this may also be done by the analysis of variance technique. This latter technique is very useful in ascertaining whether data can be considered homogeneous.

Several proposed methods for making multiple measurements on a sample of oil are compared.

Author Information

Youden, W., J.
National Bureau of Standards, Washington, D. C.
Cameron, J., M.
National Bureau of Standards, Washington, D. C.
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Developed by Committee: E11
Pages: 27–34
DOI: 10.1520/STP44979S
ISBN-EB: 978-0-8031-5913-6
ISBN-13: 978-0-8031-6067-5