As Ben pointed out, this is not reproducible. My guess is that the
offending sample is degenerate in some way, e.g., there are no
observations in one of the six sites or no non-zero responses.
hth,
Z
On Mon, 26 Dec 2011, Melissa Aikens wrote:
Hello,
I am having a problem with the zero-infla
Melissa Aikens virginia.edu> writes:
> I am having a problem with the zero-inflated negative binomial (package
> pscl). I have 6 sites with plant populations, and I am trying to model the
> number of seeds produced as a function of their size and their site.
[snip]
>
> Anyways, the code I ha
Hello,
I am having a problem with the zero-inflated negative binomial (package
pscl). I have 6 sites with plant populations, and I am trying to model the
number of seeds produced as a function of their size and their site. There
are a lot of zero's because many of my plants get eaten before flow
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