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53.896
2006 Sep 13
3
unexpected result in glm (family=poisson) for data with an only zero response in one factor
Dear members,
here is my trouble: My data consists of counts of trapped insects in different attractive traps. I usually use GLMs with a poisson error distribution to find out the differences between my traitments (and to look at other factor effects). But for some dataset where one traitment contains only zeros, GLM with poisson family fail to find any difference between this particular traitment