[R] zeroinfl problem: cannot get standard errors, hessian has NaN

[nikkks]

Hi!

I have three models.



In the first model, everything is fine.




However, in the second and third models, I have NA's for standard errors:





The hessians also have NaN's (same for m2 and m3). 



What should I do about it? It there a way to obtain the hessian without
transforming my variables? I will greatly appreciate your help!



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