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

nikkks nikita at sagowarrior.com
Wed Jul 25 07:50:26 CEST 2012


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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