[R] Negbin Error Warnings

[Peter Ehlers]

Perhaps this will give a clue:

rpois(1,-1)
[1] NaN
Warning message:
In rpois(1, -1) : NAs produced

# (lambda needs to be nonnegative)

  -Peter Ehlers

Clara Brück wrote:
> 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.
> 
> 
> 
> ___________________________________________________________
> Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! 
> http://produkte.web.de/go/02/
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

-- 
Peter Ehlers
University of Calgary
403.202.3921