On Fri, 22 Sep 2000, Patrik Ohagen wrote:
> Sorry about the off topic posting. It is far too tempting to take
> advantage of the wealth of knowledge "on the list".
>
> Could you recommend a good introduction text on Epidemiology ?
Um, that's a big topic: a bit like asking for a good introductory
Statistics text.... What is good for a Masters' Statistics student
is not good for a trainee Medic, and v.v.
> Suppose A+B+C = 100 for all Subjects. Any ideas on how to analyze
> differences between treatment groups on a multidimensionally variable
> (a,b,c) ?
>
> You observe a, say, three dimensional variable on all subjects but the
> components always adds to 100. Did that make sense ? Any useful
> references ?
John Aitchison worked on this for many years:
@Book{Aitchison.86,
author = "J. Aitchison",
title = "The Statistical Analysis of Compositional Data",
publisher = "Chapman \& Hall",
address = "London",
year = "1986",
}
is about this, principally indeed about three components.
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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