Hi,

This page should answer your questions.

http://mathworld.wolfram.com/NegativeBinomialDistribution.html

Ritwik Sinha
http://darwin.cwru.edu

On 6/5/06, Werner Tell <wtell67@hotmail.com> wrote:
>
> Hi
>
> I'm fitting poisson and negative binomial distributions to event data. I'm
> interested in the expected number of events occuring in a time period. For
> the poisson this is determined by the parameter lambda only.
> For the neg. binomial, is the expected number of events determined by the
> parameter "mu" only or does parameter "size" influence the first moment as
> well?
>
> thank you,
> wt
>
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