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n_abs
2009 Nov 29
1
Convergence problem with zeroinfl() and hurdle() when interaction term added
Hello,
I have a data frame with 1425 observations, 539 of which are zeros. I
am trying to fit the following ZINB:
f3<-formula(Nbr_Abs~ Zone * Year + Source)
ZINB2<-zeroinfl(f3, dist="negbin", link= "logit", data=TheData,
offset=log(trans.area), trace=TRUE)
Zone is a factor with 4 levels, Year a factor with 27 levels, and
Source a factor with 3 levels. Nbr_Abs is counts of a species that
shows a high level...