Dear list,
I´m using the mgcv package to model the proportion by weight of certain prey
on the stomach content of a predator. This proportion is the ratio of two
weights (prey weight over stomach weight), and ranges between 0 and 1. The
variance is low when proportion is close to 0 and 1, and higher at
intermediate values.
It seems that the best way to go is to model this using the "quasi" family
with a logit link and a mu(1-mu) variance. Or I am missing something
obvious? I will be thankful for any input.
All the best,
Julian
--
Julian Mariano Burgos
Hafrannsóknastofnunin/Marine Research Institute
Skúlagata 4, 121 Reykjavík, Iceland
Sími/Telephone : +354-5752037
Bréfsími/Telefax: +354-5752001
Netfang/Email: jul...@hafro.is, jmbur...@uw.edu
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