Re: [R] Convergence problem with zeroinfl() and hurdle() when interaction term added

2009-11-29 Thread Achim Zeileis
On Sat, 28 Nov 2009, Sarah Valencia wrote: 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=

[R] Convergence problem with zeroinfl() and hurdle() when interaction term added

2009-11-28 Thread Sarah Valencia
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