Which glm model for proportions - ECOLOGY

Hi, in the framework of my internship i have made competition bioassays. To highlight competition, I must present my result as a population rate: Species1/(Species1+Species2) for instance, and that is where it gets tricky: If i only had counts I would be using a poisson or quasipoisson law, however, as I am working with proportions I don't realy know which law would fit the best my glm.

Here's my model: (AMF, my explanatory variable correspond to mycorrhizal treatments)

m0<-glm(evansi~AMF, Comp., family=poisson,

So, if you could help replace poisson by the best family and explain why, it would be so helpful !

Thanks you !

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.