[R] On the probabilistic distribution

From: Munyandorero, Joseph <Joseph.Munyandorero_at_myfwc.com>
Date: Fri, 29 Feb 2008 14:35:28 -0500


Dear R Community,

I first apoligize to ask statistical questions of general domain, probably beyond the mere use of R. I want to analyze the following type of data with R . Total annual fisheries landings have been reported during 1950-2007 from a given fishery area. I am dealing with annual fisheries landings proportions (LP) estimated for trophic level (TL) classes of 0.1increment, i.e. each LP cell shows an estimated proportion of all fish landed for a given decade (D) year (Y) and TL class combination (usually TL = 2-5). I have observed that 0 <= LP < 1. I am interested in testing the effects for factors D, Y, TL and for interactions TL:Y and TL:D with a view to particularly verify whether PL changed over time. I am seeking for your wise experience about the following questions:
1. Which type of probabilistic distribution am I facing? Is it normal, poisson, binomial or multinomial ?
2. What would be the most appropriate R-based approach/model to handle such a study case?
Thanks in advance.

Joseph

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