Hello r-help,

 

I try to fit birds counts over years using glm. I have done (with Estate
and year as factors):

Model1 <- glm(Females~Estate+Year+offset = log(area)), family =
quasipoisson(link = log), na.action = "na.exclude") 

After I have calculated the prediction using:

Pred1 <- predict(Model1, type = "response", na.action = "na.exclude")

 

My question is: How can I obtain predictions for Females in each year
that are standardized by averaging over the levels of Estate?

I have been advised to use log(area) as an offset because we are
actually interested in density of birds but would appreciate any good
comparisons between offset and weight.

 

Thanks in advance for any help you can give.

 

Hugues SANTIN-JANIN

hugues_sj@yahoo.fr

"Game Conservancy Trust"


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