From: Roger Newson <email@example.com>
Subject: Re: st: Re: [Stata 9] Anova and control
Date: Wed, 25 May 2005 13:42:20 +0100
At 13:25 25/05/2005, Paul Fenner wrote:
I have an anova where 3 treatments have to be compared to a control. When
I used to use SAS I used Dunnett's multiple comparison with the control
option, but cannot find any similar procedure in Stata. I was considering
using the test option and compare each treatment with the control but I am
a concerned that this does not take into account the mutiple comparisons.
I would be grateful for any suggestions on how to approach this problem.
A wide range of multiple-test procedures (including the Sidak procedure, on
which I think that Dunnett's procedure is probably based) is available
using the -smileplot- package, downloadable from SSC. This can be used
together with the -parmest- package (also downloadable from SSC), in a way
documented in Newson et al. (2003). Use the -ssc- command to download
things from SSC.
I hope this helps.
Newson, R. and the ALSPAC Study Team. 2003. Multiple-test procedures and
The Stata Journal 3(2): 109-132. Also downloadable from Roger Newson's
Lecturer in Medical Statistics
Department of Public Health Sciences
Division of Asthma, Allergy and Lung Biology
King's College London
5th Floor, Capital House
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London SE1 3QD
Tel: 020 7848 6648 International +44 20 7848 6648
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or 020 7848 6605 International +44 20 7848 6605
Opinions expressed are those of the author, not the institution.
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