Re: [R] ratio distribution - missing attachment

From: Martin Maechler <>
Date: Mon, 28 May 2007 11:36:42 +0200

Thank you, Ravi.
You probably will have noticed, that the attachment didn't make it to the mailing list.

The reason is that the we let the mailing list software strip "binary" attachments which can easily be misused to spread viruses; see --> (search "attachment") or the posting-guide.

OTOH, the software allows attachments with MIME type text/plain. If you use an e-mail software for sophisticated users, the software allows you to specify the MIME type of your attachments;
otherwise (as with most "user friendly", "modern" e-mail software), attach a *.txt file (Doug Bates uses <foo>_R.txt) and it should make it to the lists;
as a third alternative, just "cut & paste" the corresponding text into your e-mal.

I think your R function should make it to R-help (and its archives), so I'd be thankful for a repost.


>>>>> "Ravi" == Ravi Varadhan <> >>>>> on Fri, 25 May 2007 14:24:20 -0400 writes:

    Ravi> Mike, Attached is an R function to do this, along with
    Ravi> an example that will reproduce the MathCad plot shown
    Ravi> in your attached paper. I haven't checked it
    Ravi> thoroughly, but it seems to reproduce the MathCad
    Ravi> example well.

    Ravi> Ravi.

    Ravi> ----------------------------------------------------------------------------
    Ravi> -------

    Ravi> Ravi Varadhan, Ph.D.

    Ravi> Assistant Professor, The Center on Aging and Health

    Ravi> Division of Geriatric Medicine and Gerontology

    Ravi> Johns Hopkins University

    Ravi> Ph: (410) 502-2619

    Ravi> Fax: (410) 614-9625

    Ravi> Email:

    Ravi> Webpage:

    Ravi> ----------------------------------------------------------------------------
    Ravi> --------
    Ravi> -----Original Message----- From:
    Ravi> [] On Behalf Of
    Ravi> Mike Lawrence Sent: Friday, May 25, 2007 1:55 PM To:
    Ravi> Lucke, Joseph F Cc: Rhelp Subject: Re: [R] Calculation
    Ravi> of ratio distribution properties

    Ravi> According to the paper I cited, there is controversy
    Ravi> over the sufficiency of Hinkley's solution, hence     Ravi> their proposed more complete solution.

    Ravi> On 25-May-07, at 2:45 PM, Lucke, Joseph F wrote:

>> The exact ratio is given in
>> On the Ratio of Two Correlated Normal Random Variables,
>> D. V. Hinkley, Biometrika, Vol. 56, No. 3. (Dec., 1969),
>> pp. 635-639.

    Ravi> -- Mike Lawrence Graduate Student, Department of     Ravi> Psychology, Dalhousie University

    Ravi> Website: Public calendar:     Ravi>

    Ravi> "The road to wisdom? Well, it's plain and simple to
    Ravi> express: Err and err and err again, but less and less
    Ravi> and less."  - Piet Hein

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