ASTM WK69361

    Revision of D6543 - 17a Standard Guide to the Evaluation of Measurements Made by Online Coal Analyzers

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    Active Standard: D6543 - 20

    Developed by Subcommittee: D05.23 | Committee D05 | Contact Staff Manager



    comparative measurement; online coal analyzer;;


    The standard originally included two statistical evaluation methods, the Root Mean Square Deviation (RMSD) method, requiring two independent samples of each batch of coal, and the Grubbs Estimator technique, requiring three independent samples. Since its inception very few Grubbs tests have been performed. In 2014 a simplified version of Grubbs called the Latent Variable Model (LVM), a special case of Grubbs, was adopted and the Grubbs estimator method was removed. Since that time, the value of the Grubbs estimator has been recognized by the task group, not only as the basis for the LVM, but also because the resultant of the statistical method allows the user to set calibration coefficients of the analyzer based on data from the testing. This was deemed by the task group to provide value to the evaluation of the data. Therefor the task group is recommending reinsertion of the original Grubbs estimator evaluation technique and language back into the standard, in between the description of the RMSD and the LVM. Subsequent sections will be renumbered as appropriate. The editorial process also incorporates automatic numbering of sections, and automatic formatting of formulas in the Word version of the standard, so that in the future, insertions and renumbering of sections, figures, and tables will be easier.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Charles Morgan


    D05 (19-06)

    Ballot Item Approved as D6543-2020 and Pending Publication