search for: invarea

...lso affect independent variables in the model (was told this by a stat guy at our department)? My data is inventories of birds (species richness and abundance) at the scale of whole farms. Thus, each observation has a different inventory area which I am accounting for in the model as: offset = log(INVAREA). However, as a fixed effect in the model I’ve got the number of different crop types in the inventoried area. As this variable is also affected by inventoried area, I would like to account for this in some way, but I find it difficult to know the best way to do so. Right now, I have made a linea...