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.
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Peter Ehlers
University of Calgary
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