[R] negative binomial: expected number of events?

[Werner Tell]

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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