Dear Clara,

could you, please, share the summary() of your data.

bests

milton

2009/12/30 Clara Brück <clara_brueck@web.de>

> Hi,
>
> I ran a negative binomial regression (NBR) using the Zelig-package and the
> negbin model.
> When I then try to use the simumlation approach using the setx () and sim()
> functions to calculate expected values
> and first difference for different levels of one of my independent
> variables, I get 50 errors warnings, telling me that the calculation rpois
> produced NAs. However, the data I use doesn't have any NAs.
> Does this mean that the NBR-model is the wrong model for this data?
>
> Thanks in advance.
>
>
>
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