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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