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RE: st: How do you run the Waller-Duncan test in STATA?


From   Roger Newson <roger.newson@kcl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: How do you run the Waller-Duncan test in STATA?
Date   Wed, 09 Nov 2005 15:07:26 +0000

To get access to a .pdf pre-print of this Stata Journal article, and also to a .pdf presentation on the same subject from the 2003 UK Stata User Meeting, type in Stata

findit smileplot

and search the hypertext references.

Hope this helps.

Roger


At 12:17 09/11/2005, you wrote:

Whenever I read about these tests, I am reminded of an
old joke: "Standards are great. There are so many
to choose from."

The effort that goes into choosing and implementing
these tests would often be better directed at producing
a informative graphical display. I do understand that
some people are limited by bosses and/or reviewers who
insist on them and/or a P-value culture.

Given the maze of ideas and procedures, and the
uncomfortable feeling that in practice people often
choose a test on rather unsatisfactory grounds,
any golden thread to get you out of the maze is
welcome. One thread more attractive than most has
already been discussed in the Stata Journal:

SJ-3-2 st0035 . . . . . . . . . . . Multiple-test procedures and smile plots
(help smileplot if installed) . . . R. Newson & The ALSPAC Study Team
Q2/03 SJ 3(2):109--132
implements multiple test procedures to control either
the family-wise error rate or the false discovery rate;
graphical tool for summarizing a set of multiple analyses

Nick
n.j.cox@durham.ac.uk

David Airey

> In general, with ANOVA post-hoc testing, Stata does not provide
> "canned" solutions, other than the few available in "oneway". Enough
> information is left behind by "anova" for the statistician to
> program
> these tests, however. If generalized to more complex models than
> "oneway", it might make a good command and Stata Journal article!
>
> See online help and manuals for "test", "lincom", and "anova
> postestimation" if you have Stata 9. Also, see "ereturn list", after
> an anova.
>
> Point your statistician to "http://www.stata.com/support/faqs/stat/
> test1.html" for a head start!
>
> Anyone have the reference to the "Waller-Duncan" test? Is this the
> multiple range test?
>
> Duncan D B. Multiple range and multiple F tests. Biometrics 11:1-42,
> 1955.
>
> http://en.wikipedia.org/wiki/Duncan's_new_multiple_range_test
>

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--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
Division of Asthma, Allergy and Lung Biology
King's College London

5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
  or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk
Website: http://phs.kcl.ac.uk/rogernewson/

Opinions expressed are those of the author, not the institution.

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