Re: Generating overdispersed poisson data

[Gregor Gorjanc <gregor.gorjanc@bfro.uni-lj.si>]

Huso, Manuela <manuela.huso <at> oregonstate.edu> writes:
> I am carrying out some simulations in which I need to generate overdispersed
poisson data.  The rpois function only takes sample size and mean as its
arguments.  What do I need to do to create overdispersed poisson data?  I
apologize if this is a naïve question.  A search of the archives revealed
nothing on this subject.

Hi!

First sample different lambdas and then use rpois i.e. your model is
something like

y ~ Poisson(lambda)
log(lambda) = \mu + e
e ~ Normal(0, sigma^2)

Gregor