A geometric confidence ellipse approach to the estimation of the ratio of two variables (Statistics in Medicine (2008) 27, (5956-5974))

S. D. Walter, A. Gafni, S. Birch

    Research output: Contribution to journalCommentary/debatepeer-review

    Abstract

    We are grateful to Dr Etienne Kaelin for pointing out four typographic errors in the equations for this paper. These are as follows:

    1.
    The term xy in equation (1) should be replaced by:

    equation image
    2.
    Equation (3) should be

    equation image
    3.
    The first term of the unnumbered equation after equation (3) should be µy rather than µx.

    4.
    The correct version of equation (4) is

    equation image
    The numerical results of this paper as shown in the various tables are not affected by these errors because correct versions of the equations were used in their calculation.
    Dr Kaelin has offered to make available an Excel spreadsheet that will carry out the calculations for the method described in this paper.
    Original languageEnglish
    Pages (from-to)2723-2723
    Number of pages1
    JournalStatistics in medicine
    Volume28
    Issue number21
    DOIs
    Publication statusPublished - 20 Sept 2009

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