[R-sig-eco] Multivariate proportional response data

[Roy Sanderson]

Hello All

I have been given a set of proportion data, that consists of three
variables that sum to 1.0 that are the response, with two explanatory
variables (one the day of the experiment, 1 to 30, the other a two-level
treatment factor).

Given that the three response variables are non-independent, what is the
best approach to analysing them?  I'm reluctant to arcsine them, and
analyse each one independently and the raw data are not available, only
the proportions.  Presumably some sort of multinomial technique might be
appropriate?

Many thanks for any hints.

Roy

-- 
Roy Sanderson
School of Biology
Devonshire Building
Newcastle University
Newcastle upon Tyne NE1 7RU
r.a.sanderson at newcastle.ac.uk
0191 246 4835