Use of Statistics to Determine Precision of Test Methods

    Published: Jan 1950

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    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.

    Committee/Subcommittee: E11.03

    DOI: 10.1520/STP44979S

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