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Re: st: tukey/dunnett procedures

From   Roger Newson <>
Subject   Re: st: tukey/dunnett procedures
Date   Fri, 17 Jun 2011 12:36:44 +0100

Equation (9) of Dunnett (1955) is a generalization to the t-distribution of the inequality demonstrated for the Normal distribution by Sidak (1967).

Best wishes



Dunnett C. W. 1955. A Multiple Comparison Procedure for Comparing Several Treatments with a Control. Journal of the American Statistical Association 50(272), 1096-1121.

Sidak, Z. 1967. Rectangular confidence regions for the means of multivariate normal distributions. Journal of the American Statistical Association 62: 626-633.

Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Web page:
Departmental Web page:

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

On 14/06/2011 23:29, Airey, David C wrote:

Is that right? How does this work out?

I think you'll find that the Dunnett multiple-test procedure is really the Sidak multiple-test procedure. This is available using the -smileplot- package, downloadable from SSC. And the corresponding frequentist q-values are available from the -qqvalue- package, also downloadable from SSC.

Roger Newson.

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