Dear Clara,

Thanks for the reply. I am forwarding your message to the list, ok.
When I wrote was a way of get further information to help the helpers.

happy holidays,

milton

---------- Forwarded message ----------
From: Clara Brück <clara_brueck@web.de>
Date: 2009/12/30
Subject: Re: [R] Negbin Error Warnings
To: milton ruser <milton.ruser@gmail.com>




Dear Milton,

Thanks for your email. I ran the NBR-model and then tried to compute the
first differences of some
expected values:
m3.x1 <-setx(m3, advisory=1)
m3.x2 <-setx(m3, advisory=0)
m3.s1 <-sim (m3,x=m3.x1, x1=m3.x2)

However, I then get 50 error warnings, and there all like this:
In rpois(k, (mu * rgamma(k, theta))/theta) : NAs produced


Bests
Clara

> -----Ursprüngliche Nachricht-----
> Von: "milton ruser" <milton.ruser@gmail.com>
> Gesendet: 30.12.09 15:06:04
> An: Clara Brück <clara_brueck@web.de>
> CC: r-help@r-project.org
> Betreff: Re: [R] Negbin Error Warnings

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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>
>
>


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